Fix typo in encodeUriSegment documentation

Author: Josh Adams

src/Angular.js

@@ -788,7 +788,7 @@ function toKeyValue(obj) {
 
 
 /**
- * We need our custom mehtod because encodeURIComponent is too agressive and doesn't follow
+ * We need our custom method because encodeURIComponent is too agressive and doesn't follow
  * http://www.ietf.org/rfc/rfc3986.txt with regards to the character set (pchar) allowed in path
  * segments:
  *    segment       = *pchar