Removed typo as mentioned at issue #1428

Author: wouterj

cookbook/assetic/yuicompressor.rst

@@ -118,7 +118,7 @@ Disable Minification in Debug Mode
 
 Minified JavaScripts and Stylesheets are very difficult to read, let alone
 debug. Because of this, Assetic lets you disable a certain filter when your
-application is in debug mode. You can do this be prefixing the filter name
+application is in debug mode. You can do this by prefixing the filter name
 in your template with a question mark: ``?``. This tells Assetic to only
 apply this filter when debug mode is off.
 
@@ -150,4 +150,4 @@ apply this filter when debug mode is off.
 
 
 .. _`YUI Compressor`: http://developer.yahoo.com/yui/compressor/
-.. _`Download the JAR`: http://yuilibrary.com/downloads/#yuicompressor
+.. _`Download the JAR`: http://yuilibrary.com/downloads/#yuicompressor