* In manpage, do not seem to imply that NMU should be of only one
new commit.
* Qualify to Debian the manpage comment about how to do NMU.
+ * In discussion on how to start using dgit when already using git, do
+ not imply/assume that existing git history will have identical trees
+ to dgit history.
+ * Remove stray sentence in config section of manpage.
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