Fix Lean LSP module imports (helix-editor#14381)

Co-authored-by: Grégoire Locqueville <gregoire.locqueville@cnrs.fr>

Author: glocq

book/src/generated/lang-support.md

@@ -148,7 +148,7 @@
 | latex | ✓ | ✓ |  |  |  | `texlab` |
 | ld | ✓ |  | ✓ |  |  |  |
 | ldif | ✓ |  |  |  |  |  |
-| lean | ✓ |  |  |  |  | `lean` |
+| lean | ✓ |  |  |  |  | `lake` |
 | ledger | ✓ |  |  |  |  |  |
 | llvm | ✓ | ✓ | ✓ |  |  |  |
 | llvm-mir | ✓ | ✓ | ✓ |  |  |  |

languages.toml

@@ -70,7 +70,7 @@ koka = { command = "koka", args = ["--language-server", "--lsstdio"] }
 koto-ls = { command = "koto-ls" }
 kotlin-lsp = { command = "kotlin-lsp", args = ["--stdio"] }
 kotlin-language-server = { command = "kotlin-language-server" }
-lean = { command = "lean", args = ["--server"] }
+lean = { command = "lake", args = ["serve"] }
 ltex-ls = { command = "ltex-ls" }
 ltex-ls-plus = { command = "ltex-ls-plus" }
 markdoc-ls = { command = "markdoc-ls", args = ["--stdio"] }