Use correct comment character

Author: Danny McCormick

README.md

@@ -19,8 +19,8 @@ steps:
 - uses: actions/checkout@master
 - uses: actions/setup-python@v1
   with:
-    python-version: '3.x' // Version range or exact version of a Python version to use, using semvers version range syntax.
-    architecture: 'x64' // (x64 or x86)
+    python-version: '3.x' # Version range or exact version of a Python version to use, using semvers version range syntax.
+    architecture: 'x64' # (x64 or x86)
 - run: python my_script.py
 ```