[PATCH v3 2/3] Documentation: riscv: Add early boot document

[kernel test robot]

Hi Alexandre,

kernel test robot noticed the following build warnings:

[auto build test WARNING on v6.4-rc7]
[also build test WARNING on linus/master next-20230623]
[cannot apply to lwn/docs-next]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Alexandre-Ghiti/Documentation-riscv-Add-early-boot-document/20230623-175814
base:   v6.4-rc7
patch link:    https://lore.kernel.org/r/20230623095547.51881-2-alexghiti%40rivosinc.com
patch subject: [PATCH v3 2/3] Documentation: riscv: Add early boot document
reproduce: (https://download.01.org/0day-ci/archive/20230624/202306240844.hWqCe54e-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp at intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202306240844.hWqCe54e-lkp@intel.com/

All warnings (new ones prefixed by >>):

>> Documentation/riscv/boot.rst:122: WARNING: Unknown interpreted text role "c:var".

vim +122 Documentation/riscv/boot.rst

   121	
 > 122	1. :c:func:`setup_vm` installs a temporary kernel mapping in
   123	   :c:var:`early_pg_dir` which allows discovery of the system memory. Only the
   124	   kernel text/data are mapped at this point. When establishing this mapping, no
   125	   allocation can be done (since the system memory is not known yet), so
   126	   :c:var:`early_pg_dir` page table is statically allocated (using only one
   127	   table for each level).
   128	

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