docs/file_domain: Update cloudflare spelling and URLs

Summary:
Cloudflare now spell themselves as `Cloudflare`.[1]

[1]: https://www.cloudflare.com/trademark/

Signed-off-by: Yongmin Hong <revi@omglol.email>

Test Plan: Read the Docs ™️.

Reviewers: O1 Blessed Committers, valerio.bozzolan

Reviewed By: O1 Blessed Committers, valerio.bozzolan

Subscribers: tobiaswiese, valerio.bozzolan, Matthew, Cigaryno

Differential Revision: https://we.phorge.it/D25616

src/docs/user/configuration/configuring_file_domain.diviner

@@ -38,7 +38,7 @@ can improve performance.
 | Method | Setup Difficulty | Cost | Notes |
 |---|---|---|---|
 | AWS CloudFront | Very Easy | Cheap | Recommended |
-| CloudFlare | Easy | Free/Cheap | Recommended |
+| Cloudflare | Easy | Free/Cheap | Recommended |
 | Self Hosted | Moderate | Free | No CDN unless you're an ops wizard. |
 
 Approach: AWS CloudFront
@@ -62,23 +62,23 @@ domain. If you see this page, it means you've configured things correctly.
 
 Continue to "Configuring Phorge", below.
 
-Approach: CloudFlare
+Approach: Cloudflare
 ========
 
-WARNING: You should review all your CloudFlare settings, and be very
+WARNING: You should review all your Cloudflare settings, and be very
 sure to turn off all JavaScript, HTML, CSS minification and
 optimization features, including systems like "Rocket Loader". These
 features will break Phorge in strange and mysterious ways that
-are unpredictable. Only allow CloudFlare to cache files, and never
+are unpredictable. Only allow Cloudflare to cache files, and never
 optimize them.
 
-[[ https://cloudflare.com | CloudFlare ]] is a general-purpose CDN service.
+[[ https://www.cloudflare.com | Cloudflare ]] is a general-purpose CDN service.
 
-To set up CloudFlare, you'll need to register a second domain and go through
+To set up Cloudflare, you'll need to register a second domain and go through
 their enrollment process to host the alternate domain on their servers. Use a
 CNAME record to forward a subdomain to your Phorge install.
 
-CloudFlare will automatically generate SSL certificates for hosted domains,
+Cloudflare will automatically generate SSL certificates for hosted domains,
 which can significantly reduce the cost and complexity of setup.
 
 Once configured, accessing the CNAME-forwarded subdomain should return a