Minor textual changes to developer instructions

docs/instructions.rst

@@ -2,7 +2,7 @@ Instructions
 ============
 
 This document contains instructions for a few tasks that you might have to do as
-a Stackspin developer
+a Stackspin developer.
 
 Building a new version of Zulip
 -------------------------------
@@ -18,14 +18,14 @@ the following:
    the whole ref, ``5e90b32f40`` in our example.
 3. A local copy of our fork of `the docker-zulip repository
    <https://github.com/greenhost/docker-zulip>`__ (at least until `our pull
-   request is merged <https://github.com/zulip/docker-zulip/pull/325>`__
+   request is merged <https://github.com/zulip/docker-zulip/pull/325>`__).
 
    This is necessary because we have added the ``SOCIAL_AUTH_OIDC_ENABLED_IDPS``
    variable to the ``entrypoint.sh`` docker entrypoint script. Without our
    changes, setting OIDC settings through environment variables is impossible.
 
 Once you have these two things, you can run the following build command to build
-the container:
+the image:
 
 .. code::
 
@@ -36,7 +36,7 @@ the container:
 
 The build argument ZULIP_GIT_REF tells the Dockerfile to use that ref when
 checking out and building Zulip. The tag is necessary so you can push the new
-Zulip container to our registry after building with the following command:
+Zulip image to our registry after building with the following command:
 
 .. code::