[clang-tools-extra] Fix #41439: Update the documentation with the correct information. (PR #69377)

[via cfe-commits]

https://github.com/Da-Viper created https://github.com/llvm/llvm-project/pull/69377

Fixes #41439

 The documentation is update to say it is allowed to have omitted parameter names if the variable is not used 

>From 0e0a3e7ad1a0a7098e05a5164413369eaa58c55b Mon Sep 17 00:00:00 2001
From: Ezike Ebuka <yerimyah1 at gmail.com>
Date: Tue, 17 Oct 2023 20:49:47 +0100
Subject: [PATCH] Fix #41439: Update the documentation with the correct
 information.

---
 .../clang-tidy/checks/readability/named-parameter.rst    | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/clang-tools-extra/docs/clang-tidy/checks/readability/named-parameter.rst b/clang-tools-extra/docs/clang-tidy/checks/readability/named-parameter.rst
index 8d28c0aa02169a7..7e7099b3df251d1 100644
--- a/clang-tools-extra/docs/clang-tidy/checks/readability/named-parameter.rst
+++ b/clang-tools-extra/docs/clang-tidy/checks/readability/named-parameter.rst
@@ -10,7 +10,12 @@ Guide:
 
 https://google.github.io/styleguide/cppguide.html#Function_Declarations_and_Definitions
 
-All parameters should be named, with identical names in the declaration and
-implementation.
+A parameter name may be omitted only if the parameter is not used in the
+function's definition.
+
+.. code-block:: c++
+int doingSomething(int a, int b, int) {  // Ok: the third paramet is not used
+    return a + b;
+}
 
 Corresponding cpplint.py check name: `readability/function`.