Fix typo (#2670)

* Fix typo

* Remove double space

src/Misc/layoutroot/run-helper.cmd.template

@@ -2,7 +2,7 @@
 SET UPDATEFILE=update.finished
 "%~dp0\bin\Runner.Listener.exe" run %*
 
-rem using `if %ERRORLEVEL% EQU N` insterad of `if ERRORLEVEL N`
+rem using `if %ERRORLEVEL% EQU N` instead of `if ERRORLEVEL N`
 rem `if ERRORLEVEL N` means: error level is N or MORE
   
 if %ERRORLEVEL% EQU 0 (

src/Runner.Listener/Configuration/CredentialManager.cs

@@ -46,7 +46,7 @@ namespace GitHub.Runner.Listener.Configuration
 
             if (!store.HasCredentials())
             {
-                throw new InvalidOperationException("Credentials not stored.  Must reconfigure.");
+                throw new InvalidOperationException("Credentials not stored. Must reconfigure.");
             }
 
             CredentialData credData = store.GetCredentials();