minor #14706 Remove white space (james2001)

This PR was merged into the 4.4 branch.

Discussion
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Remove white space

Fix the line color

Commits
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134df97 Remove white space

Author: javiereguiluz

quick_tour/the_architecture.rst

@@ -155,7 +155,7 @@ difference is that it's done in the constructor:
         {
             // ...
 
-     +        $this->logger->info('Using the greeting: '.$greeting);
+    +        $this->logger->info('Using the greeting: '.$greeting);
 
              return $greeting;
         }