Add a few apostrophes in comments

Author: gregjacobs

src/Autolinker.js

@@ -341,11 +341,11 @@ Autolinker.prototype = {
 
 				// Process around anchor tags, and any inner text / html they may have
 				if( tagName === 'a' ) {
-					if( !isClosingTag ) {  // its the start <a> tag
+					if( !isClosingTag ) {  // it's the start <a> tag
 						anchorTagStackCount++;
 						resultHtml.push( this.processTextNode( textToProcess ) );
 
-					} else {   // its the end </a> tag
+					} else {   // it's the end </a> tag
 						anchorTagStackCount = Math.max( anchorTagStackCount - 1, 0 );  // attempt to handle extraneous </a> tags by making sure the stack count never goes below 0
 						if( anchorTagStackCount === 0 ) {
 							resultHtml.push( textToProcess );  // We hit the matching </a> tag, simply add all of the text from the start <a> tag to the end </a> tag without linking it