Fix excluded_uri_prefixes usage

[adriendupuis]

Question	Answer
JIRA Ticket	IBX-11449
Versions	5.0, 4.6
Edition	All

Insist on excluded_uri_prefixes being an array of prefixes, add trailing slashes to avoid side effects.

Previews:

• Multisite configuration > Location tree: Explain why trailing slashes.
• Set up campaign SiteAccess > Reuse content: Link excluded_uri_prefixes to "Multisite configuration > Location tree".
• Create Customer Portal: Add trailing slashes to excluded_uri_prefixes in 3 config examples where there is no highlight on this part of the config.

Checklist

• Text renders correctly
• Text has been checked with vale
• Description metadata is up to date
• Redirects cover removed/moved pages
• Code samples are working
• PHP code samples have been fixed with PHP CS fixer
• Added link to this PR in relevant JIRA ticket or code PR

[github-actions]

Preview of modified files

Preview of modified Markdown:

• docs/customer_management/cp_page_builder.md
• docs/multisite/multisite_configuration.md
• docs/multisite/set_up_campaign_siteaccess.md

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

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