docs: fix missing comma issue #10377

Job	Run time
Build	2m 0s
Run integration tests (test-e2e)	20m 58s
Run integration tests (test-integration-poller)	9m 55s
Benchmark	9m 49s
Lint	3m 36s
Run integration tests (test-e2e-deployments)	13m 44s
Check jsonnet & tempo-mixin	48s
Run Unit Tests (test-with-cover-pkg)	3m 56s
Vendor check	1m 33s
Build technical documentation	19s
Run Unit Tests (test-with-cover-tempodb)	16m 10s
Run Unit Tests (test-with-cover-tempodb-wal)	12m 13s
Run Unit Tests (test-with-cover-others)	12m 41s
	1h 47m 42s

Provide feedback