drop the doc/ directory in doc_files for building rpm (#286)

(cherry picked from commit 4ec608e)

Author: wpoely86

setup.cfg

@@ -8,7 +8,6 @@ include = pyslurm, pyslurm.*
 release = 1
 packager = Giovanni Torres <[email protected]>
 doc_files = README.md
-            doc/
             examples/
 build_requires = python3-devel >= 3.6
                  slurm-devel >= 21.08.0