[MERGE][0.17] sanitize developers docs

[Aaron Bentley]

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Alexander Belchenko wrote:
> Subj.
> 
> BTW, what's about performance.dot?

It's a graphical summary of the information in
planned-performance-changes.txt, showing the dependencies between changes.

- -- locality of reference: If an operation requires data that is located
+
+- locality of reference:
+
+   If an operation requires data that is located
    within a small region at any point, we often get better performance
    than with an implementation of the same operation that requires the
    same amount of data but with a lower locality of reference. Its

^^^^^^^ I'm not sure this is a correct edit.

=== renamed file doc/developers/revert.txt // doc/developers/revert.rst

^^^^^^^ We should probably decide what extension to us for our rst
files, but at present either .txt or .rst is being used.

=== modified file doc/developers/bundle-creation.rst
- --- doc/developers/bundle-creation.rst
+++ doc/developers/bundle-creation.rst
@@ -1,5 +1,5 @@
 Bundle Creation
- -===============
+---------------

^^^^^^^^^^ we probably also need to standardize our heading order, since
ReST doesn't.  But I find it counterintuitive for "===" to be less
significant than "---".

Aaron
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