docs: Fix list item indentation mistakes.

Signed-off-by: Anders Kaseorg <anders@zulip.com>

docs/contributing/summer-with-zulip.md

@@ -268,9 +268,9 @@ Success for the student means a few things, in order of importance:
   plan it, you can get several round trips in per day even with big timezone
   differences like USA + India.
 
--  What exactly you focus on in your mentorship will vary from week to week and
-   depend somewhat on what the student needs. It might be any combination of
-   these things:
+- What exactly you focus on in your mentorship will vary from week to week and
+  depend somewhat on what the student needs. It might be any combination of
+  these things:
 
   - Helping the student plan, chunk, and prioritize their work.
 

docs/production/authentication-methods.md

@@ -424,11 +424,11 @@ it as follows:
        ```
     4. Set the proper permissions on these files and directories:
 
-    ```bash
-    chown -R zulip.zulip /etc/zulip/saml/
-    find /etc/zulip/saml/ -type f -exec chmod 644 -- {} +
-    chmod 640 /etc/zulip/saml/zulip-private-key.key
-    ```
+       ```bash
+       chown -R zulip.zulip /etc/zulip/saml/
+       find /etc/zulip/saml/ -type f -exec chmod 644 -- {} +
+       chmod 640 /etc/zulip/saml/zulip-private-key.key
+       ```
 
 1. (Optional) If you configured the optional public and private server
    certificates above, you can enable the additional setting

requirements/README.md

@@ -12,6 +12,7 @@ Of the files, only dev, prod, and mypy have been used in the install
 scripts directly. The rest are implicit dependencies.
 
 Steps to update a lock file, e.g. to update ipython from 5.3.0 to latest version:
+
 0. Remove entry for `ipython==5.3.0` in dev.txt.
 1. Run `./tools/update-locked-requirements`, which will generate new entries, pinned to the latest version.
 2. Increase `PROVISION_VERSION` in `version.py`.