Fix API doc formatting

Ensure some code examples are flagged as ``code``

csppfetch/__init__.py

@@ -668,9 +668,9 @@ class Downloader:
         period*N) for integers N from 0 through infinity
 
         Normally environment variable names take package_env_id and append the
-        specific value needed (ex. "TIMEOUT"). env_overrides maps the specific
+        specific value needed (ex. ``TIMEOUT``). env_overrides maps the specific
         value needed and to the environment variable name (ex.
-        {"TIMEOUT":"CSPP_GEO_AITF_ANCIL_CONNECT_TIMEOUT"}
+        ``{"TIMEOUT":"CSPP_GEO_AITF_ANCIL_CONNECT_TIMEOUT"}``
 
         >>> from datetime import timedelta, datetime
         >>> sst_filename = "avhrr-only-v2.%Y%m%d{priority}.nc"