Node mutator classes all have a central #dispatch method that were
previously all documented with similar but inconsistent short
descriptions:
- "Emit mutations"
- "Emit mutants"
- "Perform dispatch"
This commit standardizes these comments to "Emit mutations"
* I do not use 1.9.3
* Also keeping them in each file increases mental overhead (true it *can* be autoamted)
* None of the files encodes NON ASCII chars.
* I do not expect it makes any difference, since nobody programmatically
will consume strings generated by mutant under the assumption they are UTF-8 encoded.
* 1.9.3 Users have to deal with the encoding fuckup under ruby anyways.
