Update docs links + slightly tweak language for behavior change deprecations

[jtcohen6]

follow-up to #10063

Cosmetic change only, no changes to functionality.

Problem

We have a docs page that details legacy behaviors, which we're deprecating / changing via "behavior change flags":

• https://docs.getdbt.com/reference/global-configs/legacy-behaviors
• https://github.com/dbt-labs/dbt-core/blob/main/docs/eli64/behavior-change-flags.md

The docs team decided (rightly) that the super-long anchors weren't a good look in dbt-labs/docs.getdbt.com#5389. Now it looks like this (better):

Solution

Instead of linking to specific anchors, just link to the docs page. This looks much cleaner in the logs. If we start having too many of these flags (more than a dozen), we can handle via better navigation within the docs site.

🎩

Checklist

• I have read the contributing guide and understand what's expected of me
• I have run this code in development and it appears to resolve the stated issue
• This PR includes tests, or tests are not required/relevant for this PR
• This PR has no interface changes (e.g. macros, cli, logs, json artifacts, config files, adapter interface, etc) or this PR has already received feedback and approval from Product or DX
• This PR includes type annotations for new and modified functions

[github-actions]

Thank you for your pull request! We could not find a changelog entry for this change. For details on how to document a change, see the contributing guide.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.21%. Comparing base (65791e4) to head (5a1aaf7).

Additional details and impacted files

@@           Coverage Diff           @@
##             main   #10077   +/-   ##
=======================================
  Coverage   88.21%   88.21%           
=======================================
  Files         181      181           
  Lines       22748    22749    +1     
=======================================
+ Hits        20068    20069    +1     
  Misses       2680     2680           

Flag	Coverage Δ
integration	85.60% <100.00%> (-0.01%)	⬇️
unit	62.64% <100.00%> (+<0.01%)	⬆️

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