Docs: Typo Fix

Change-Id: I0fe7201b141e19a407396a9f7be6260625bdaa88
Signed-off-by: Elena Uziunaite <elena.uziunaite@arm.com>
diff --git a/docs/contributing/doc_guidelines.rst b/docs/contributing/doc_guidelines.rst
index b1a2db6..21d0135 100644
--- a/docs/contributing/doc_guidelines.rst
+++ b/docs/contributing/doc_guidelines.rst
@@ -85,7 +85,7 @@
     ###################
 
     ******************
-    Chapter Ttitle(H2)
+    Chapter Title (H2)
     ******************
 
     Chapter Section (H3)