docs: marvell: Update info about WTP and MV_DDR_PATH parameters

Signed-off-by: Pali Rohár <pali@kernel.org>
Change-Id: Id5e36b7ba3a840cb3598c580e806b52d8e8dd70f

docs/plat/marvell/armada/build.rst

@@ -123,6 +123,9 @@ There are several build options:
 
         For the mv_ddr source location, check the section "Tools and external components installation"
 
+        If MV_DDR_PATH source code is a git snapshot then provide path to the full git
+        repository (including .git subdir) because mv_ddr build process calls git commands.
+
 - CP_NUM
 
         Total amount of CPs (South Bridge) connected to AP. When the parameter is omitted,
@@ -194,6 +197,9 @@ There are several build options:
         directory, which can be found as a3700_utils.zip in the release. Usage
         example: ``WTP=/path/to/a3700_utils``
 
+        If WTP source code is a git snapshot then provide path to the full git
+        repository (including .git subdir) because WTP build process calls git commands.
+
 - CRYPTOPP_PATH
 
         For Armada37x0 only, use this parameter tp point to Crypto++ source code