Cortex A9: Fix typo in errata 794073 workaround

Change-Id: I22568caf83b9846cd7b59241fcec34a395825399
Signed-off-by: Louis Mayencourt <louis.mayencourt@arm.com>
diff --git a/docs/cpu-specific-build-macros.rst b/docs/cpu-specific-build-macros.rst
index 7b7f4cd..e1c89bf 100644
--- a/docs/cpu-specific-build-macros.rst
+++ b/docs/cpu-specific-build-macros.rst
@@ -73,7 +73,7 @@
 
 For Cortex-A9, the following errata build flags are defined :
 
--  ``ERRATA_A9_794073``: This applies errata 794073 workaround to Cortex-A15
+-  ``ERRATA_A9_794073``: This applies errata 794073 workaround to Cortex-A9
    CPU. This needs to be enabled for all revisions of the CPU.
 
 For Cortex-A15, the following errata build flags are defined :