style(docs): unify quote style in GFM instructions

Use single quotes in frontmatter and asterisks for emphasis
markers for consistency.

Signed-off-by: umatare5 <umatare5@gmail.com>
AI-assisted-by: GitHub Copilot Coding Agent

Author: umatare5

.github/instructions/markdown-gfm.instructions.md

@@ -1,6 +1,6 @@
 ---
-description: "Markdown formatting for GitHub-flavored markdown (GFM) files"
-applyTo: "**/*.md"
+description: 'Markdown formatting for GitHub-flavored markdown (GFM) files'
+applyTo: '**/*.md'
 ---
 
 # GitHub Flavored Markdown (GFM)
@@ -31,13 +31,13 @@ Apply these rules per the [GFM spec](https://github.github.com/gfm/) when writin
 - **Link reference definitions**: `[label]: destination "title"`. Case-insensitive label matching. First definition wins for duplicate labels. Cannot interrupt a paragraph.
 - **Paragraphs**: Consecutive non-blank lines not interpretable as other block constructs. Leading spaces up to 3 are stripped.
 - **Blank lines**: Ignored between blocks; determine whether a list is tight or loose.
-- **Tables** _(extension)_: Header row, delimiter row (`---`, `:---:`, `---:`), zero or more data rows. Delimit cells with `|`. Escape literal pipe as `\|`. Header and delimiter must have matching column count. Broken at first blank line or other block-level structure.
+- **Tables** *(extension)*: Header row, delimiter row (`---`, `:---:`, `---:`), zero or more data rows. Delimit cells with `|`. Escape literal pipe as `\|`. Header and delimiter must have matching column count. Broken at first blank line or other block-level structure.
 
 ## Container Blocks
 
 - **Block quotes**: Lines prefixed with `>` (optionally followed by a space). Lazy continuation allowed for paragraph text only. A blank line separates consecutive block quotes.
 - **List items**: Bullet markers (`-`, `+`, `*`) or ordered markers (1–9 digits + `.` or `)`). Content column determined by marker width + spaces to first non-whitespace. Sublists must be indented to the content column. An ordered list interrupting a paragraph must start with `1`.
-- **Task list items** _(extension)_: `- [ ]` (unchecked) or `- [x]` (checked) at the start of a list item paragraph. Space between `-` and `[` is required. May be nested.
+- **Task list items** *(extension)*: `- [ ]` (unchecked) or `- [x]` (checked) at the start of a list item paragraph. Space between `-` and `[` is required. May be nested.
 - **Lists**: Sequence of same-type list items. Changing bullet character or ordered delimiter starts a new list. A list is loose if any item is separated by a blank line.
 
 ## Inlines
@@ -46,13 +46,13 @@ Apply these rules per the [GFM spec](https://github.github.com/gfm/) when writin
 - **Entity and numeric character references**: `&`, `{`, `{` — valid HTML5 entities. Not recognized in code spans or code blocks. Cannot replace structural characters.
 - **Code spans**: Backtick-delimited inline code. Line endings convert to spaces. Leading and trailing space stripped when both present. Backslash escapes are literal inside code spans.
 - **Emphasis and strong emphasis**: `*`/`_` for `<em>`, `**`/`__` for `<strong>`. `_` is not allowed for intraword emphasis. Left-flanking / right-flanking delimiter run rules apply. Delimiter run length sum must not be a multiple of 3 when one delimiter can both open and close (unless both lengths are multiples of 3).
-- **Strikethrough** _(extension)_: `~~text~~` — one or two tildes. Does not span across paragraphs. Three or more tildes do not create strikethrough.
+- **Strikethrough** *(extension)*: `~~text~~` — one or two tildes. Does not span across paragraphs. Three or more tildes do not create strikethrough.
 - **Links**: Inline `[text](url "title")` or reference `[text][label]` / `[text][]` / `[text]`. Link text may contain inlines but not other links. Destination in `<…>` allows spaces. No whitespace between link text and `(` or `[`.
 - **Images**: `![alt](src "title")` — same syntax as links prefixed with `!`. Alt text is the plain-string content of the description.
 - **Autolinks**: `<URI>` or `<email>` in angle brackets. Scheme must be 2–32 characters starting with an ASCII letter.
-- **Autolinks** _(extension)_: Bare `http://`, `https://`, `www.` URLs and bare email addresses auto-link without angle brackets. Trailing punctuation excluded; parentheses balanced.
+- **Autolinks** *(extension)*: Bare `http://`, `https://`, `www.` URLs and bare email addresses auto-link without angle brackets. Trailing punctuation excluded; parentheses balanced.
 - **Raw HTML**: Open/close tags, comments (`<!-- -->`), processing instructions (`<? ?>`), declarations (`<!…>`), CDATA (`<![CDATA[…]]>`) are passed through.
-- **Disallowed raw HTML** _(extension)_: `<title>`, `<textarea>`, `<style>`, `<xmp>`, `<iframe>`, `<noembed>`, `<noframes>`, `<script>`, `<plaintext>` have their leading `<` replaced with `&lt;`.
+- **Disallowed raw HTML** *(extension)*: `<title>`, `<textarea>`, `<style>`, `<xmp>`, `<iframe>`, `<noembed>`, `<noframes>`, `<script>`, `<plaintext>` have their leading `<` replaced with `&lt;`.
 - **Hard line breaks**: Two+ trailing spaces or `\` before a line ending. Not recognized in code spans or HTML tags.
 - **Soft line breaks**: A line ending not preceded by two+ spaces or `\`. Rendered as a space in browsers.
 
@@ -65,4 +65,4 @@ Apply these rules per the [GFM spec](https://github.github.com/gfm/) when writin
 - [ ] Emphasis uses `*` for intraword; `_` only at word boundaries.
 - [ ] Strikethrough uses exactly `~~` (not 3+ tildes).
 - [ ] Links use `[text](url)` or reference syntax with no whitespace before `(` or `[`.
-- [ ] No disallowed raw HTML tags (`<script>`, `<style>`, `<title>`, `<textarea>`, `<xmp>`, `<iframe>`, `<noembed>`, `<noframes>`, `<plaintext>`).
+- [ ] No disallowed raw HTML tags (`<script>`, `<style>`, `<title>`, `<textarea>`, `<xmp>`, `<iframe>`, `<noembed>`, `<noframes>`, `<plaintext>`).