fix(enterprise-scim): replace "Github" with "GitHub" in all doc page_title fields

[vmvarela]

Copilot reviewer on upstream PR integrations#3012 flagged all four SCIM doc files using page_title: "Github: ..." instead of page_title: "GitHub: ...".

Files to fix

• website/docs/d/enterprise_scim_group.html.markdown
• website/docs/d/enterprise_scim_groups.html.markdown
• website/docs/d/enterprise_scim_user.html.markdown
• website/docs/d/enterprise_scim_users.html.markdown

Change required

page_title: "Github: github_enterprise_scim_*"
→
page_title: "GitHub: github_enterprise_scim_*"

Acceptance Criteria

• All four doc files use GitHub (capital H) in page_title
• PR opened against enterprise-scim branch
• PR merged into enterprise-scim and then master

[vmvarela]

Fixed in PR #41, merged into enterprise-scim.