Reword LOAD_IMAGE_V2 in user guide & fix a typo

Change-Id: Id2639218dfffec84d8b0fa295d7e896129d4fcd7
Signed-off-by: John Tsichritzis <john.tsichritzis@arm.com>
diff --git a/docs/user-guide.rst b/docs/user-guide.rst
index da26026..2b90bec 100644
--- a/docs/user-guide.rst
+++ b/docs/user-guide.rst
@@ -485,8 +485,8 @@
 -  ``LOAD_IMAGE_V2``: Boolean option to enable support for new version (v2) of
    image loading, which provides more flexibility and scalability around what
    images are loaded and executed during boot. Default is 0.
-   Note: ``TRUSTED_BOARD_BOOT`` is currently only supported for AArch64 when
-   ``LOAD_IMAGE_V2`` is enabled.
+
+   Note: this flag must be enabled for AArch32 builds.
 
 -  ``LOG_LEVEL``: Chooses the log level, which controls the amount of console log
    output compiled into the build. This should be one of the following: