Fix metrics capitalization

doc/api/project_vulnerabilities.md

@@ -4,7 +4,7 @@ group: Threat Insights
 info: "To determine the technical writer assigned to the Stage/Group associated with this page, see https://handbook.gitlab.com/handbook/product/ux/technical-writing/#assignments"
 ---
 
-# Project Vulnerabilities API
+# Project vulnerabilities API
 
 DETAILS:
 **Tier:** Ultimate

doc/user/analytics/value_streams_dashboard.md

@@ -84,7 +84,7 @@ Each bar on the chart displays the sum of total projects per score category, cal
 To exclude data from the chart (for example, "Not Included"), in the legend select the series you want to exclude.
 Hovering over each bar reveals a dialog that explains the score's definition.
 
-For example, if a project has a high score for Deployment Frequency (Velocity), it means that the project has one or more deploys to production per day.
+For example, if a project has a high score for deployment frequency (velocity), it means that the project has one or more deploys to production per day.
 
 | Metric | Description | High | Medium | Low |
 |--------|-------------|------|--------|-----|