Addons-frontend: Add info about AMO API to /about page

[caitmuenster]

On https://addons.mozilla.org/about, let's add some info about the AMO API.

Under Get Involved, let's add:

• Want to interact with addons.mozilla.org (AMO) programmatically? Check out the documentation for the Add-ons Servers documentation for details about the AMO APIs, the APIs used by the Add-ons Manager.

Related note: can we also add a '.' next to 'wiki' at the end of To see more ways you can contribute to the add-on community, please visit our wiki?

[championshuttler]

Here you go @rahulsyal2512!. Feel free to ask questions if you need any help. Going to help him to tackle this bug.

[rahulsyal2512]

@championshuttler I have made necessary changes, please review it. Thank you for the guidance :)

[willdurand]

* Want to interact with addons.mozilla.org (AMO) programmatically?  Check out the documentation for the [Add-ons Servers documentation](https://addons-server.readthedocs.io/en/latest/index.html) for details about the AMO APIs, the APIs used by the [Add-ons Manager](https://blog.mozilla.org/firefox/add-ons-manager/).

@caitmuenster I find this paragraph hard to read. There are two repetitions:

• "the documentation for the Add-ons Servers documentation"
• "about the AMO APIs, the APIs"

I suggest we change the wording a bit, like:

Want to interact with addons.mozilla.org (AMO) programmatically? Check out the Add-ons Servers documentation for details about the APIs used by AMO and the Add-ons Manager.

[caitmuenster]

Thanks for flagging @willdurand! Your wording makes sense -- let's go with that.

@rahulsyal2512, if you could update your PR to reflect Will's wording above, that would be awesome!

🙏🏼

[rahulsyal2512]

@caitmuenster I have changed the wording as per the comment.

[willdurand]

Thank you for your first contribution @rahulsyal2512!

[AlexandraMoga]

Verified fixed on -dev with FF66, Win10x64