doc:doc-guide: fix a typo and an error

Fix a typo in sphinx.rst and a minor error in parse-header.rst
Signed-off-by: NFederico Vaga <federico.vaga@vaga.pv.it>
Signed-off-by: NJonathan Corbet <corbet@lwn.net>

Documentation/doc-guide/parse-headers.rst

@@ -133,7 +133,7 @@ For both statements, \ **type**\  can be either one of the following:
 
 \ **symbol**\
 
- The ignore or replace statement will apply to the name of enum statements
+ The ignore or replace statement will apply to the name of enum value
  at C_FILE.
 
  For replace statements, \ **new_value**\  will automatically use :c:type:

Documentation/doc-guide/sphinx.rst

@@ -28,7 +28,7 @@ The ReST markups currently used by the Documentation/ files are meant to be
 built with ``Sphinx`` version 1.3 or upper. If you're desiring to build
 PDF outputs, it is recommended to use version 1.4.6 or upper.
 
-There's a script that checks for the Spinx requirements. Please see
+There's a script that checks for the Sphinx requirements. Please see
 :ref:`sphinx-pre-install` for further details.
 
 Most distributions are shipped with Sphinx, but its toolchain is fragile,