Miscellaneous doc fixes for v1.2

Change-Id: I6f49bd779f2a4d577c6443dd160290656cdbc59b
diff --git a/common/aarch64/context.S b/common/aarch64/context.S
index 3d13a80..0baa9b2 100644
--- a/common/aarch64/context.S
+++ b/common/aarch64/context.S
@@ -303,7 +303,7 @@
 
 	/*
 	 * No explict ISB required here as ERET to
-	 * swtich to secure EL1 or non-secure world
+	 * switch to secure EL1 or non-secure world
 	 * covers it
 	 */