Update zocial.css

A few grammatical mistakes resolved.

css/zocial.css

@@ -1,7 +1,7 @@
 @charset "UTF-8";
 
 /*!
-	Zocial Butons
+	Zocial Buttons
 	http://zocial.smcllns.com
 	by Sam Collins (@smcllns)
 	License: http://opensource.org/licenses/mit-license.php
@@ -478,7 +478,7 @@ a.zocial {
 
 /*
 The Miscellaneous Buttons
-These button have no icons and can be general purpose buttons while ensuring consistent button style
+These buttons have no icons and can be general purpose buttons while ensuring consistent button style
 Credit to @guillermovs for suggesting
 */