change C++ tag to C for Windows PGO Learning Path as C++ doesn't work as a URL

Author: jasonrandrews

content/learning-paths/laptops-and-desktops/win_profile_guided_optimisation/_index.md

@@ -20,7 +20,7 @@ author: Tom Dunkle
 skilllevels: Introductory
 subjects: Performance and Architecture
 tools_software_languages:
-    - C++
+    - C
     - MSVC
     - Google Benchmark
     - PGO