Fixed typos in Development - Rake Tasks doc

doc/development/rake_tasks.md

@@ -2,7 +2,7 @@
 
 ## Setup db with developer seeds:
 
-Note that if your db user does not have advanced privilegies you must create db manually before run this command 
+Note that if your db user does not have advanced privileges you must create the db manually before running this command.
 
 ```
 bundle exec rake setup
@@ -10,7 +10,7 @@ bundle exec rake setup
 
 ## Run tests
 
-This runs all test suite present in GitLab 
+This runs all test suites present in GitLab.
 
 ```
 bundle exec rake test
@@ -18,7 +18,7 @@ bundle exec rake test
 
 ## Generate searchable docs for source code
 
-You can find results under `doc/code` directory
+You can find results under the `doc/code` directory.
 
 ```
 bundle exec rake gitlab:generate_docs