fix(tabs): add sphinx-tabs directives to exclusion

Add the sphinx-tabs directives to the directive exclusion list for
rstcheck. Rstcheck is only really useful for vanilla RST, so we need to
ignore the parsing of some of the more advanced directives.

Fixes: 05a602b ("Yocto: Building the SDK: Add basic tabs")
Signed-off-by: Randolph Sapp <[email protected]>

Author: StaticRocket

.rstcheck.cfg

@@ -1,5 +1,5 @@
 [rstcheck]
-ignore_directives = ifconfig
+ignore_directives = ifconfig,tabs,tab,group-tab,code-tab
 # ignore the following languages because they require external compilers and
 # snippets in this repo depend on external code
 ignore_languages = c,cpp,c++