To generate a code exammple,
{generate_code_example|<api_doc_md>|example} sounds better and
more intuitive than,
{generate_code_example|<api_doc_md>|method}
Some of our code examples can only be run with administrator
credentials (such as create-user). Thus, the Markdown extension
for generating code examples should have an option to include
the lines that recommend using an admin zuliprc instead of a
non-admin one.
Now that the Markdown extension defined in
zerver/lib/bugdown/api_generate_examples depended on code in the
tools/lib/* directory, it caused the production tests to fail since
the tools/ directory wouldn't exist in a production environment.
This commit adds a Markdown extension that allows the following
syntax,
{generate_code_example|<md_file_name>|<fixture or method>}
to generate code examples and fixtures found in tools/lib/api_tests.py
and templates/zerver/api/fixtures.json, respectively.
