help/dates: use DATE as place-holder in help and abort texts
The use of "{datetime}" was unfortunate since I as a user never knew
if I was expected to do
hg log -d '>{2011-04-01}'
or
hg log -d '>2011-04-01'
The word "datetime" is also confusing -- calling it a date it much
simpler.
bugzilla: fix reST error introduced in
22d200e49b10
All blocks must be indented. Here we can use a field list instead of a
verbatim block for a real list layout.
help/dates: rephrase explanation of internal format
The old explanation referred to the two numbers as "unixtime" and
"offset" without really defining those terms.