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extdiff: add comments and minor variable renames diffpatch()

Authored by pulkit.

Description

extdiff: add comments and minor variable renames diffpatch()

Some variable names were now confusing as we refactored the code in a separate
function. For example, node1a leads to ideas why 1a and not 1. The
variable storing path to patch file was named as dirX instead of fileX.
Renamed these variables and added couple of comments.

Differential Revision: https://phab.mercurial-scm.org/D8689

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