Update precedence table for borrow operators #1776
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This is intended to help navigate to what the thing it is referring to. Unfortunately this makes the markdown source a little messy, but other approaches weren't much better.
This removes `&` and `&mut` and instead just links to the full grammar for what the borrow operators are. There are many other variants, like `&&` or `&raw`, and I didn't want to write all of them down. The keywords after the `&&` are just modifiers, and are not really separate things to be considered anyways. Closes rust-lang#1726
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This updates the precedence table so that it is clear that it includes all the various syntax forms of the borrow operator (including things like
&&and&raw).I also linkified everything in the table just to make it easier to navigate to the various forms.
Closes #1726