Change "auto generated" to "auto-generated" (#544)

Change "auto generated" to "auto-generated"

.gitignore

@@ -13,7 +13,7 @@
 # User-specific files (MonoDevelop/Xamarin Studio)
 *.userprefs
 
-# Mono auto generated files
+# Mono auto-generated files
 mono_crash.*
 
 # Build results
@@ -40,7 +40,7 @@ bld/
 
 dist/
 
-# Visual Studio 2017 auto generated files
+# Visual Studio 2017 auto-generated files
 Generated\ Files/
 
 # MSTest test Results
@@ -354,4 +354,4 @@ MigrationBackup/
 .ionide/
 
 # Mac-specific
-.DS_Store
+.DS_Store