doc/Makefile: Don't show Makefile comments in output
The comments makes sense when editing Makefile, but not when watching its
output where it looks too much like error messages.
1 files updated, 0 files merged, 0 files removed, 0 files unresolved
created new head
@ 4: L2
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o 3: L1
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| o 2: C3
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o 1: C2
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o 0: C1
% Conflicting rebase
merging common
warning: conflicts during merge.
merging common failed!
abort: fix unresolved conflicts with hg resolve then run hg rebase --continue
% Abort
rebase aborted
@ 4: L2
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o 3: L1
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| o 2: C3
|/
o 1: C2
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o 0: C1