logging levels and corresponding macros

[jesusbv]

As discussed in issue 121,

The loggin levels are mentioned in the use section

[brson]

Thanks a bunch @jesusbv, and sorry for taking so long to get back to you.

I wonder if you might take a slightly different approach here, and instead of creating a new 'logging levels' section, write some prose that gets this same information across, setting the stage for the detail that comes in following section.

It might begin like

# Use

The basic use of the log crate is through the five logging macros: [`error!`], [`warn!`], { etc },
where `error!` represents the highest-priority log level, and `trace!` the lowest.
Each of these macros accept format strings similarly to `println!`.

For the hyperlinks you'll want to use rustdoc links, not code links; for the internal links, relative links, and the std links absolute links.

So the error! link would probably be ./macro.error.html and the println! link https://doc.rust-lang.org/stable/std/macro.println.html.

If you convert the list to prose you'll probably want to use out-of-line links like

The [`error!`] macro.

[`error!`]: ./macro.error.html

[jesusbv]

Thanks for the update @brson. Sorry not to reply sooner.

I have converted it to prose version and updated the links.

[brson]

Thanks a bunch @jesusbv. Sorry for the long delay. Feel free to ping me on irc or email any time.

[brson]

Can you put a comma before 'where'?

[brson]

These changes of "implementation" to "framework" seem indicative of a problem. Previously there was a patch merged that converted "framework" to "implementation", and I assume you did not mean to change these all to "framework". Can you take a look at this diff and see if all these changes are intended? It may be prudent to re-start from the master branch and just make the intended change again.