Over time the discussion about "lifecycle" blocks in the documentation
became confusing because the docs originally written for managed resource
lifecycle got partially generalized for resources of other modes and for
module calls, even though each of those has a completely different
lifecycle and thus a different set of lifecycle settings.
This is a first pass at trying to reorganize that so that the "lifecycle"
page is really just an index of all of the different kinds of lifecycle
block that exist in the language, while the main documentation for each
use of that block type now belongs with the documentation of the block
it's nested within.
While working on this I also found that there was some duplication inside
the "data sources" page where the same information was described multiple
times, and a few other cases where things had become inconsistent over
time. This also includes a little extra content to try to clarify the
difference between managed, data, and ephemeral resources and to make it
explicit that the "Resources" section is focused only on managed resources
because that is the primary resource mode.
As usual there's lots more that could be done here -- this documentation
has gradually evolved over time and is full of weird quirks due to that
evolution -- but I decided to draw a line here so that the diff wouldn't
get too large.
Signed-off-by: Martin Atkins <mart@degeneration.co.uk>
