[clang/docs] add a missing brace in ClangFormatStyleOptions.rst (#145145)

... in the example for `WrapNamespaceBodyWithEmptyLines: Never`

Author: kedartal

clang/docs/ClangFormatStyleOptions.rst

@@ -6992,7 +6992,7 @@ the configuration (without a prefix: ``Auto``).
     .. code-block:: c++
 
       namespace N1 {
-      namespace N2
+      namespace N2 {
       function();
       }
       }

clang/include/clang/Format/Format.h

@@ -5275,7 +5275,7 @@ struct FormatStyle {
     /// Remove all empty lines at the beginning and the end of namespace body.
     /// \code
     ///   namespace N1 {
-    ///   namespace N2
+    ///   namespace N2 {
     ///   function();
     ///   }
     ///   }