remove ilm+ccr warning from docs
This commit removes the ILM + CCR warning for 6.7.
[partintro]
--
-WARNING: {ilm-cap} is currently not supported by
-{stack-ov}/ccr-getting-started.html#ccr-getting-started-leader-index[leader indices] and
-{stack-ov}/ccr-getting-started.html#ccr-getting-started-follower-index[follower indices].
-
The <<index-lifecycle-management-api, {ilm} ({ilm-init}) APIs>> enable you to
automate how you want to manage your indices over time. Rather than simply
performing management actions on your indices on a set schedule, you can base
