Spelling

Author: BielinskiLukasz

CONTRIBUTING.md

@@ -20,7 +20,7 @@ Create a feature branch and start improving:
 % git checkout -b my-feature-branch
 ```
 
-HEAD-based development is prefered, which means all changes are applied
+HEAD-based development is preferred, which means all changes are applied
 directly on top of master.
 
 ### Step 3: Commit

README.md

@@ -9,7 +9,7 @@ Selenium Shutterbug is a utility library written in Java for making screenshots
 
 ## Code Example
 
-Screenhot of the page with scrolling (for Chrome to make screenshot of the whole page but not viewport only):
+Screenshot of the page with scrolling (for Chrome to make screenshot of the whole page but not viewport only):
 ```
 Shutterbug.shootPage(driver, ScrollStrategy.BOTH_DIRECTIONS).save("C:\\testing\\screenshots\\");
 ```