Edit documentation grammar

Minor documentation changes to correct (?) grammar.

Signed-off-by: Heikki Laaksonen <laaksonen.heikki.j@gmail.com>

docs/source/introduction.rst

@@ -1,7 +1,7 @@
 Introduction
 ============
 
-Snippy-tldr is plugin to import tldr man pages into snippy_ tool. This is a
+Snippy-tldr is plugin to import tldr man pages for snippy_ tool. This is a
 plugin that itself does not have any functionality without the snippy tool.
 
 .. _snippy: https://github.com/heilaaks/snippy

snippy_tldr.py

@@ -17,10 +17,10 @@
 #  See the License for the specific language governing permissions and
 #  limitations under the License.
 
-"""Snippy-tldr is a plugin to import tldr man pages to snippy."""
+"""Snippy-tldr is a plugin to import tldr man pages for snippy."""
 
 class SnippyTldr(object):  # pylint: disable=too-few-public-methods
-    """Plugin to import tldr man pages to snippy."""
+    """Plugin to import tldr man pages for snippy."""
 
     def __init__(self):
         print("hello from snippy-tldr")

tests/test_snippy_tldr.py

@@ -16,7 +16,7 @@
 #  See the License for the specific language governing permissions and
 #  limitations under the License.
 
-"""test-snippy-tldr: Test snippy plugin to import tldr man pages.."""
+"""test-snippy-tldr: Test snippy plugin to import tldr man pages."""
 
 from snippy_tldr import SnippyTldr