[chore] Update release docs based on 0.77.0 release

[TylerHelmuth]

Updates based on releasing Contrib and Release repos.

I encountered this error when pushing the tags in Contrib despite previous tags pushing as expected.

pushing tag exporter/googlemanagedprometheusexporter/v0.77.0
Enumerating objects: 1, done.
Counting objects: 100% (1/1), done.
Writing objects: 100% (1/1), 400 bytes | 9.00 KiB/s, done.
Total 1 (delta 0), reused 0 (delta 0), pack-reused 0
remote: fatal error in commit_refs
To https://github.com/open-telemetry/opentelemetry-collector-contrib.git
 ! [remote rejected]       exporter/googlemanagedprometheusexporter/v0.77.0 -> exporter/googlemanagedprometheusexporter/v0.77.0 (failure)
error: failed to push some refs to 'https://github.com/open-telemetry/opentelemetry-collector-contrib.git'
make: *** [push-tags] Error 1

I didn't try rerunning make push-tags bc it looked like it would try to re-push existing tags. If the real solution is to rerun the push-tags make target I'll update this PR.

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (8464b71) 91.25% compared to head (f7533bf) 91.25%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7647   +/-   ##
=======================================
  Coverage   91.25%   91.25%           
=======================================
  Files         296      296           
  Lines       14477    14477           
=======================================
  Hits        13211    13211           
  Misses       1002     1002           
  Partials      264      264           

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[Aneurysm9]

Suggested change

	for tag in `cat tags.txt`; do \
	for tag in `git tag | grep vX.Y.Z`; do \

This is the approach I usually take for Go SDK releases. Push all tags of the appropriate version. Hopefully easier than constructing a list of tags by hand.

[TylerHelmuth]

Luckily I could copy and paste the list into the file bc the target printed it out, but I like this idea more.