docs: sphinx: Fix couple of spellings in the file rstFlatTable.py

s/automaticly/automatically/
s/buidler/builder/

..and a sentence construction fix.
Signed-off-by: Bhaskar Chowdhury <unixbhaskar@gmail.com>
Acked-by: Randy Dunlap <rdunlap@infradead.org>
Link: https://lore.kernel.org/r/20210301201052.11067-1-unixbhaskar@gmail.comSigned-off-by: Jonathan Corbet <corbet@lwn.net>

Documentation/sphinx/rstFlatTable.py

@@ -22,7 +22,7 @@ u"""
 
     * *auto span* rightmost cell of a table row over the missing cells on the
       right side of that table-row.  With Option ``:fill-cells:`` this behavior
-      can changed from *auto span* to *auto fill*, which automaticly inserts
+      can be changed from *auto span* to *auto fill*, which automatically inserts
       (empty) cells instead of spanning the last cell.
 
     Options:
@@ -161,7 +161,7 @@ class ListTableBuilder(object):
         for colwidth in colwidths:
             colspec = nodes.colspec(colwidth=colwidth)
             # FIXME: It seems, that the stub method only works well in the
-            # absence of rowspan (observed by the html buidler, the docutils-xml
+            # absence of rowspan (observed by the html builder, the docutils-xml
             # build seems OK).  This is not extraordinary, because there exists
             # no table directive (except *this* flat-table) which allows to
             # define coexistent of rowspan and stubs (there was no use-case