Sdk doc nits

Author: Danny McCormick

README.md

@@ -2,7 +2,7 @@
 
 This action sets up a dotnet environment for use in actions by:
 
-- optionally downloading and caching a version of dotnet by version and adding to PATH
+- optionally downloading and caching a version of dotnet by SDK version and adding to PATH
 - registering problem matchers for error output
 
 # Usage
@@ -15,7 +15,7 @@ steps:
 - uses: actions/checkout@master
 - uses: actions/setup-dotnet@v1
   with:
-    version: '2.2.103' // Version to use.
+    version: '2.2.103' // SDK Version to use.
 - run: dotnet build <my project>
 ```
 

action.yml

@@ -3,7 +3,7 @@ description: 'Setup a Dotnet environment and add it to the PATH, additionally pr
 author: 'GitHub'
 inputs: 
   version:
-    description: 'Version to use. E.g. 2.2.104'
+    description: 'SDK version to use. E.g. 2.2.104'
 runs:
   using: 'node12'
   main: 'lib/setup-dotnet.js'