Documentation on using small C libraries in Mbed OS bare metal

[evedon]

This documentation is dependent on upcoming PR to build baremetal profile with smaller libaries by using

{
 "target_overrides": {
   "*": {  
     "target.default_lib": "small"
   }
 }
}

[evedon]

Note that I am mentioning default_lib and not c_lib as we don't have a PR for that change yet. This page will be updated once the code change is in.

[evedon]

@AnotherButler This documentation is for Mbed 6. Please review when you can.

[bulislaw]

Why is that HTML header rather than markdown markup?

[AnotherButler]

It's a unique header ID. We use it in certain circumstances across products, such as to prevent duplication of URLs, to shorten URLs and when we want the URL to be something other than the header.

[evedon]

Code has been merged so this PR is ready to go.

[AnotherButler]

Is this relevant for 5.15, too, or only the next release?

[evedon]

This is relevant for 6.