Merge pull request DataDog#10000 from DataDog/kaylyn/comma

adding missed comma

Add blog link to serverless trace prop page (DataDog#9999)

Merge pull request DataDog#9997 from DataDog/kari/reserved-attributes

Make list of reserved attributes easier to find

Merge pull request DataDog#9994 from DataDog/kari/docs-1670

DOCS-1670 Add note about SAML mapping being case sensitive

Merge pull request DataDog#9989 from DataDog/tian.chu/serverless-inst…

…allation-aws-chalice

Add serverless installation instructions for AWS Chalice

Merge pull request DataDog#9993 from DataDog/kari/docs-1673

fix broken links on OTel Python page

Merge pull request DataDog#9990 from DataDog/guacbot/translation-2021…

…0310084851

Translation PR

Merge pull request DataDog#9874 from DataDog/apm/php/pcntl-codeigniter

apm/php: clarify generic vs full instrumentation + pcntl incompatibility

Merge pull request DataDog#9988 from DataDog/ruth/docs-9934

Fix PR 9934

Merge pull request DataDog#9987 from DataDog/ruth/docs-1714

DOCS-1714 Metric Units