Fix typos in documentation

In the porting guide, there are blue boxes that describe the argument
types and the return type of each function.  A small typo caused some of
these boxes not being properly rendered.

In the user guide, small typos were fixed that caused random text being
unintentionally rendered as bold.  Also, a slight rewording was done in
the section describing the DYN_DISABLE_AUTH flag.

Change-Id: I57303ca609436a82162fa9b42c06b0d5a63da6df
Signed-off-by: John Tsichritzis <john.tsichritzis@arm.com>

docs/porting-guide.rst

@@ -1661,6 +1661,7 @@ Function : bl2\_plat\_preload\_setup [optional]
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 ::
+
     Argument : void
     Return   : void
 
@@ -1674,6 +1675,7 @@ Function : plat\_try\_next\_boot\_source() [optional]
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 ::
+
     Argument : void
     Return   : int
 
@@ -1704,6 +1706,7 @@ Function : bl2\_el3\_early\_platform\_setup() [mandatory]
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 ::
+
 	Argument : u_register_t, u_register_t, u_register_t, u_register_t
 	Return   : void
 
@@ -1726,6 +1729,7 @@ Function : bl2\_el3\_plat\_arch\_setup() [mandatory]
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 ::
+
 	Argument : void
 	Return   : void
 
@@ -1741,6 +1745,7 @@ Function : bl2\_el3\_plat\_prepare\_exit() [optional]
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
 ::
+
 	Argument : void
 	Return   : void
 

docs/user-guide.rst

@@ -323,10 +323,10 @@ Common build options
 -  ``DEBUG``: Chooses between a debug and release build. It can take either 0
    (release) or 1 (debug) as values. 0 is the default.
 
--  ``DYN_DISABLE_AUTH``: Enables the capability to disable Trusted Board Boot
-   authentication. This option is only meant to be enabled for development
-   platforms. Both TRUSTED_BOARD_BOOT and the LOAD_IMAGE_V2 flags need to be
-   set if this flag has to be enabled. 0 is the default.
+-  ``DYN_DISABLE_AUTH``: Provides the capability to dynamically disable Trusted
+   Board Boot authentication at runtime. This option is meant to be enabled only
+   for development platforms. Both TRUSTED_BOARD_BOOT and LOAD_IMAGE_V2 flags
+   must be set if this flag has to be enabled. 0 is the default.
 
 -  ``EL3_PAYLOAD_BASE``: This option enables booting an EL3 payload instead of
    the normal boot flow. It must specify the entry point address of the EL3
@@ -919,8 +919,7 @@ To check the entire source tree, you must first download copies of
 ``checkpatch.pl``, ``spelling.txt`` and ``const_structs.checkpatch`` available
 in the `Linux master tree`_ scripts directory, then set the ``CHECKPATCH``
 environment variable to point to ``checkpatch.pl`` (with the other 2 files in
-the same directory) and build the target 
-checkcodebase:
+the same directory) and build the target checkcodebase:
 
 ::