Slightly improve documentation

Author: amotl

src/crate/client/doctests/http.txt

@@ -181,7 +181,7 @@ an exception is raised when the timeout is reached::
     ...
     crate.client.exceptions.ConnectionError: No more Servers available, exception from last server: ...
 
-When connecting to non Crate servers the HttpClient will raise a ConnectionError like this::
+When connecting to non-CrateDB servers, the HttpClient will raise a ConnectionError like this::
 
     >>> http_client = HttpClient(["https://httpbin.org/html"])
     >>> http_client.server_infos(http_client._get_server())

src/crate/client/doctests/mocking.txt

@@ -5,7 +5,7 @@ Client Mocking
 For testing purposes it is often useful to replace the client used for
 communication with the CrateDB server with a stub or mock.
 
-This can be done by passing a object of the Client class when calling the
+This can be done by passing an object of the Client class when calling the
 ``connect`` method::
 
     >>> from crate import client