[clang] [clang-tools-extra] [AstMatcher]`templateArgumentCountIs` support `FunctionDecl` (PR #130416)

[Carlos Galvez via cfe-commits]

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@@ -4833,6 +4833,17 @@ <h2 id="narrowing-matchers">Narrowing Matchers</h2>
 </pre></td></tr>
 
 
+<tr><td>Matcher<<a href="https://clang.llvm.org/doxygen/classclang_1_1FunctionDecl.html">FunctionDecl</a>></td><td class="name" onclick="toggle('templateArgumentCountIs2')"><a name="templateArgumentCountIs2Anchor">templateArgumentCountIs</a></td><td>unsigned N</td></tr>
+<tr><td colspan="4" class="doc" id="templateArgumentCountIs2"><pre>Matches if the number of template arguments equals N.
+
+Given
+  template<typename T> struct C {};
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carlosgalvezp wrote:

Shouldn't this example be for `functionDecl`, instead of `classTemplateSpecializationDecl`?

https://github.com/llvm/llvm-project/pull/130416