Fix restructured text

Minimal fixes to restructured text so that it renders properly on [pypi index page](https://pypi.org/project/slapos.core)

/reviewed-on nexedi/slapos.core!65

MANIFEST.in

@@ -3,4 +3,4 @@ include slapos/proxy/schema.sql
 include slapos/slapos-client.cfg.example
 include slapos/slapos-proxy.cfg.example
 include slapos/slapos.cfg.example
-recursive-include slapos *.in *.txt *.xsd
+recursive-include slapos *.in *.txt *.xsd *.rst

slapos/README.grid.rst

@@ -5,11 +5,11 @@ grid
   This section is outdated, ``slapgrid`` command was reorganised in ``slapos`` sub-commands.
 
 
-slapgrid is a client of SLAPos. SLAPos provides support for deploying a SaaS
+slapgrid is a client of SlapOS. SlapOS provides support for deploying a SaaS
 system in a minute.
 Slapgrid allows you to easily deploy instances of softwares based on buildout
 profiles.
-For more informations about SLAP and SLAPos, please see the SLAP documentation.
+For more informations about SLAP and SlapOS, please see the SLAP documentation.
 
 
 Requirements