github newrelic/docs-website release-08.19.2021-18.01

🚀 What's new?

@HenryTech - Change values to match screenshots ->
@paperclypse - Some tips on avoiding callout fatigue ->
@dbarnesbrownNR - Merge pull request #3557 from HenryTech/patch-12 ->
@roadlittledawn - fix: add referrer policy header option for gatsby cloud plugin ->
@roadlittledawn - Merge pull request #3567 from newrelic/clang/fix-referrer-policy-header ->
@paperclypse - Added info about a subset of callout fatigue ->
@paperclypse - Merge pull request #3562 from newrelic/avoid-callout-fatigue ->

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