merge: improve documentation of fbid dict used for merge bid
I improved the comments explaning what the dict contains meanwhile organizing
the comment structure which prevents some confusion.
Due to formatting issues, the empty dict was wrapped in `()` which might decieve
in thinking that it's a tuple of dict until you decide to find a comma.
Differential Revision: https://phab.mercurial-scm.org/D8818
# See http://EditorConfig.org for the specification
root = true
[*.py]
indent_size = 4
indent_style = space
trim_trailing_whitespace = true
[*.{c,h}]
indent_size = 8
indent_style = tab
trim_trailing_whitespace = true
[*.t]
indent_size = 2
indent_style = space
trim_trailing_whitespace = false