Merge pull request Codeception#169 from kirgy/docs/07-BDD-background-grammar

Documentation grammar fix

Author: Naktibalda

docs/07-BDD.md

@@ -400,7 +400,7 @@ Let's improve our BDD suite by using the advanced features of Gherkin language.
 
 ### Background
 
-If a group of scenarios have the same initial steps, let's that for dashboard we need always need to be logged in as administrator. We can use *Background* section to do the required preparations and not to repeat same steps across scenarios.
+If a group of scenarios have the same initial steps we can define a *Background* section to be used prior to those steps being run. This allows us to avoid repeating our steps across multiple scenarios. Let's say that for the dashboard feature we always need to be logged in as administrator.
 
 {% highlight gherkin %}
 
@@ -640,4 +640,4 @@ If you like the concept of Behavior Driven Development or prefer to keep test sc
 
 
 * **Next Chapter: [Customization >](/docs/08-Customization)**
-* **Previous Chapter: [< AdvancedUsage](/docs/07-AdvancedUsage)**
+* **Previous Chapter: [< AdvancedUsage](/docs/07-AdvancedUsage)**