Update ArgParserAttributes.fs

Author: Smaug123

WoofWare.Myriad.Plugins.Attributes/ArgParserAttributes.fs

@@ -96,11 +96,9 @@ type ArgumentDefaultValueAttribute (defaultValue : obj) =
 /// contributes: it appears on the header line which introduces that group, above the indented list
 /// of the arguments themselves. (That header is written whether or not you supply any help text.)
 ///
-/// When applied to a nested argument record or union -- one which is not itself [<ArgParser>]-tagged,
-/// but is reached through a field of one -- the help text describes that type wherever it is
-/// embedded, and so heads the group in each place. If the field which embeds it carries an
-/// [<ArgumentHelpText>] of its own, the field's wins: it is the more specific placement, and one type
-/// may be embedded at several sites for different purposes.
+/// When applied to a nested argument record or union, the help text instead heads the group of
+/// arguments the nesting causes. If the field which embeds it carries an `[<ArgumentHelpText>]`
+/// of its own, the field's wins, on the grounds that it's the more specific text.
 type ArgumentHelpTextAttribute (helpText : string) =
     inherit Attribute ()