fix(webvital) github casing (#17045)

Author: bruno-garcia

docs/product/issues/issue-details/performance-issues/web-vitals/index.mdx

@@ -22,7 +22,7 @@ The detector for this performance issue runs on a schedule and checks the 7 day
 The following additional criteria must hold true:
 
 - You must have [Seer](/product/ai-in-sentry/seer/) enabled on your Sentry account.
-- You must have a [Github code mapping](/organization/integrations/source-code-mgmt/github/) configured for your project.
+- You must have a [GitHub code mapping](/organization/integrations/source-code-mgmt/github/) configured for your project.
 - There must be at least `10` sample spans for the given vital (_this value is [configurable](/product/issues/issue-details/performance-issues/#configuration)_).
 - There must be no issues currently open for the same Web Vitals metrics on the page being evaluated.