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

[Carlos Galvez via cfe-commits]

================
@@ -4833,6 +4833,17 @@ <h2 id="narrowing-matchers">Narrowing Matchers</h2>
 </pre></td></tr>
 
 
+<tr><td>Matcher&lt;<a 
href="https://clang.llvm.org/doxygen/classclang_1_1FunctionDecl.html";>FunctionDecl</a>&gt;</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&lt;typename T&gt; struct C {};
----------------
carlosgalvezp wrote:

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

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