Capitalize Thor gem name

[ci skip]

railties/lib/rails/command.rb

@@ -37,7 +37,7 @@ module Rails
         end
       end
 
-      # Rails finds namespaces similar to thor, it only adds one rule:
+      # Rails finds namespaces similar to Thor, it only adds one rule:
       #
       # Command names must end with "_command.rb". This is required because Rails
       # looks in load paths and loads the command just before it's going to be used.

railties/lib/rails/generators.rb

@@ -219,7 +219,7 @@ module Rails
       [[ "rails", rails ]] + groups.sort.to_a
     end
 
-    # Rails finds namespaces similar to thor, it only adds one rule:
+    # Rails finds namespaces similar to Thor, it only adds one rule:
     #
     # Generators names must end with "_generator.rb". This is required because Rails
     # looks in load paths and loads the generator just before it's going to be used.