Shorten header that is too long

...6-remove-api-fuzzing-ci-configuration-create-mutation.yml

data/deprecations/14-8-graphql-project-network-policies.yml

.../deprecations/15-1-pipelinesecurityreportfinding-name.yml

...15-1-pipelinesecurityreportfinding-projectfingerprint.yml

...eprecations/15-3-vulnerabilityFindingDismiss-mutation.yml

...eprecations/15-5-vulnerabilityFindingDismiss-mutation.yml

...deprecate-disabled-with-override-runner-setting-value.yml

data/deprecations/15-9-Vault-integration.yml

...deprecations/16-3-runner-terminationgracepriodseconds.yml

...cations/16-9-rename-require_password_to_approve-field.yml

doc/update/deprecations.md