docs(doxygen): enable C++ overloading support for SQL functions

Changed OPTIMIZE_OUTPUT_FOR_C from YES to NO in Doxyfile to enable
C++ overloading support. SQL supports function overloading (like C++),
but C does not. This setting allows Doxygen to better handle overloaded
SQL functions, though a Doxygen limitation still causes the first
overload in each group to be skipped during extraction.

Related documentation: docs/api/markdown/PARSING_NOTES.md

Author: tobyhede

Doxyfile

@@ -81,7 +81,9 @@ SHOW_NAMESPACES        = YES
 #---------------------------------------------------------------------------
 
 JAVADOC_AUTOBRIEF      = YES
-OPTIMIZE_OUTPUT_FOR_C  = YES
+# Changed from YES to NO to support SQL function overloading
+# C doesn't support overloading, but SQL does (like C++)
+OPTIMIZE_OUTPUT_FOR_C  = NO
 
 # Disable some C++-specific features that don't apply to SQL
 BUILTIN_STL_SUPPORT    = NO