remove inappropriate comma

A qualifying clause beginning with words like "as", "if", or "although" should have a comma separating it from any following clauses in a sentence, but should not have a comma immediately after the beginning word, unless it is to separate a third, non-essential clause.  

Example 1: "Although I would quite like to go to lunch with you, I find myself instead writing a detailed commit message to justify a single-character documentation change."

Example 2: "Despite, as you might well imagine, wishing I hadn't even noticed it in the first place, I still felt the error was worth correcting."

guides/source/security.textile

@@ -627,7 +627,7 @@ h4. Whitelists versus Blacklists
 
 -- _When sanitizing, protecting or verifying something, whitelists over blacklists._
 
-A blacklist can be a list of bad e-mail addresses, non-public actions or bad HTML tags. This is opposed to a whitelist which lists the good e-mail addresses, public actions, good HTML tags and so on. Although, sometimes it is not possible to create a whitelist (in a SPAM filter, for example), _(highlight)prefer to use whitelist approaches_:
+A blacklist can be a list of bad e-mail addresses, non-public actions or bad HTML tags. This is opposed to a whitelist which lists the good e-mail addresses, public actions, good HTML tags and so on. Although sometimes it is not possible to create a whitelist (in a SPAM filter, for example), _(highlight)prefer to use whitelist approaches_:
 
 * Use before_filter :only => [...] instead of :except => [...]. This way you don't forget to turn it off for newly added actions.
 * Use attr_accessible instead of attr_protected. See the mass-assignment section for details