Rename 'macOS-11.0' to 'macOS-11' everywhere (#3417)

* rename 'macos11.0' to 'macos-11'

* fix nitpicks

* resolve conflicts

images/macos/macos-11-Readme.md

@@ -299,4 +299,3 @@
 | ANDROID_SDK_ROOT        | /Users/runner/Library/Android/sdk                                                                  |
 
 
-

images/macos/templates/macOS-11.json

@@ -88,7 +88,7 @@
         },
         {
             "type": "file",
-            "source": "./toolsets/toolset-11.0.json",
+            "source": "./toolsets/toolset-11.json",
             "destination": "~/image-generation/toolset.json"
         },
         {

images/macos/toolsets/toolset-11.json

@@ -216,4 +216,4 @@
             "5.0"
         ]
     }
-}
+}