github newrelic/docs-website release-12.16.2021-17.53

🚀 What's new?

@barbnewrelic - Update glossary.mdx ->
@mangulonr - Create deprecation-notice-v1.15andlower.mdx ->
@x8a - feat(RN Kubernetes): Added Frontmatter and anchors ->
@x8a - style(K8s RN): Edited for some style ->
@zuluecho9 - fix(TDP nav): fixing bad order of intro docs ->
@maken-newr - Update new-relic-ios-compatibility-requirements.mdx ->
@alanwest - Remove confusing "Efficiency" section ->
@nr-kkenney - fix: add serializers for strong & b elements ->
@barbnewrelic - Update glossary.mdx ->
@zuluecho9 - Merge pull request #5345 from newrelic/API-nav-file-fix ->
@rhetoric101 - Merge pull request #5347 from maken-newr/patch-4 ->
@nr-kkenney - Merge pull request #5351 from newrelic/5348_fix_strong_b_serialization ->
@nr-kkenney - chore: remove test.only ->
@nr-kkenney - Merge pull request #5352 from newrelic/5348_remove_test_only ->
@barbnewrelic - Merge pull request #5316 from newrelic/barbnewrelic-patch-1 ->
@barbnewrelic - Update security-bulletin-nr21-03.mdx ->
@x8a - Merge pull request #5344 from mangulonr/patch-30 ->
@barbnewrelic - Update security-bulletin-nr21-04.mdx ->
@barbnewrelic - Update security-bulletins.mdx ->
@rhetoric101 - Merge pull request #5350 from alanwest/patch-1 ->
@barbnewrelic - Merge pull request #5355 from newrelic/log4j-121621-cpm ->
@barbnewrelic - Merge pull request #5354 from newrelic/log4j-121521 ->
@barbnewrelic - Merge pull request #5356 from newrelic/log4j-security-summary ->

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