[documentation-guide] Fix a typo

[Jared Smith]

commit 2c7b690d14ad5c320a6db19696dd80a40ffdd942
Author: Jared K. Smith <jaredsmith at jaredsmith.net>
Date:   Sat Feb 7 16:10:46 2015 +0100

    Fix a typo

 en-US/style.xml |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)
---
diff --git a/en-US/style.xml b/en-US/style.xml
index cda5820..74f3e3e 100644
--- a/en-US/style.xml
+++ b/en-US/style.xml
@@ -275,7 +275,7 @@
 			<para>Without the final comma, it is hard to tell if the final item is a "bar" or a "bar and baz".  (Writers and editors sometimes refer to this punctuation as a "Harvard comma" or "serial comma.")</para>
 		</section>
 		<section id="sect-documentation_guide-style-common_mistakes-contractions">
-			<title>Constractions</title>
+			<title>Contractions</title>
 			<para>Avoid contractions in professional writing.  They are rarely needed or desired, and they are a common source of errors.  When using them, writers often make errors that include spelling, placement of apostrophes, and improper usage within a sentence.  The first rule to remember about contractions is that the apostrophe should be placed where the last omission of letters occurs.</para>
 		</section>
 	</section>