add missing dots at ends of command descriptions

Signed-off-by: Vladimir Rutsky <vladimir@rutsky.org>

docs/api.md

@@ -257,7 +257,7 @@ You can now use this with 'environment' for `create_container`.
 
 ## diff
 
-Inspect changes on a container's filesystem
+Inspect changes on a container's filesystem.
 
 **Params**:
 
@@ -345,7 +345,7 @@ chunks. A string containing response data otherwise.
 
 ## export
 
-Export the contents of a filesystem as a tar archive to STDOUT
+Export the contents of a filesystem as a tar archive to STDOUT.
 
 **Params**:
 
@@ -375,7 +375,7 @@ An example of how to get (save) an image to a file.
 
 ## history
 
-Show the history of an image
+Show the history of an image.
 
 **Params**:
 
@@ -517,7 +517,7 @@ single dict
 
 ## inspect_image
 
-Identical to the `docker inspect` command, but only for images
+Identical to the `docker inspect` command, but only for images.
 
 **Params**:
 
@@ -528,7 +528,7 @@ single dict
 
 ## kill
 
-Kill a container or send a signal to a container
+Kill a container or send a signal to a container.
 
 **Params**:
 
@@ -648,7 +648,7 @@ Identical to the `docker pull` command.
 ## push
 
 Push an image or a repository to the registry. Identical to the `docker push`
-command
+command.
 
 **Params**:
 
@@ -824,7 +824,7 @@ Tag an image into a repository. Identical to the `docker tag` command.
 **Returns** (bool): True if successful
 
 ## top
-Display the running processes of a container
+Display the running processes of a container.
 
 **Params**: