Add trailing slash to the graphql URLs

[mathjazz]

Both of these URLs for:

https://mozilla-pontoon-staging.herokuapp.com/graphql?query=%7Bprojects%7Bname,missingStrings,approvedStrings%7D%7D

https://mozilla-pontoon-staging.herokuapp.com/graphql/?query=%7Bprojects%7Bname,missingStrings,approvedStrings%7D%7D

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 76.47059% with 4 lines in your changes missing coverage. Please review.

Project coverage is 80.51%. Comparing base (fbeb09b) to head (598df38).
Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
pontoon/api/tests/test_urls.py	50.00%	4 Missing ⚠️

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[flodolo]

1. Do we want to update the links in the documentation?

BTW, the curl example doesn't work on macOS+zsh without quotes

curl --globoff "http://localhost:8000/graphql?query={projects{name}}"

2. As I mentioned in the other PR, this works in the browser on DEV where the URL is redirected (e.g. graphql?query={projects{name}} ⇾ graphql/#query=%7B%0A%20%20projects%20%7B%0A%20%20%20%20name%0A%20%20%7D%0A%7D.

But it doesn't work when I try with curl (even on DEV, no need to switch to PROD): I get an empty answer, while if I manually add the / I get an answer.

$ curl --globoff -w "\nStatus code: %{http_code} \n" "http://localhost:8000/graphql?query={projects{name}}"


Status code: 301
$ curl --globoff -w "\nStatus code: %{http_code} \n" "http://localhost:8000/graphql/?query={projects{name}}"

{"data":{"projects":[{"name":"Terminology"}]}}
Status code: 200

[mathjazz]

Explicitly added support for the URLs with trailing slashes.

I've updated the docs, to make the URLs consistent with the TM and Terminology download URLs.

[mathjazz]

BTW, the curl example doesn't work on macOS+zsh without quotes

I couldn't reproduce that.

[flodolo]

Looks good 👍🏼

Can we quote the curl addresses with {} though? This works in both bash and zsh