docs: Remove mention about having to enable subscriptions in the docs

[bellini666]

The subscriptions feature is now enabled by default.

Not only that, but the keyword to enable it got removed in https://github.com/strawberry-graphql/strawberry/releases/tag/0.245.0

Fix #644

Summary by Sourcery

Documentation:

• Remove outdated instructions for enabling subscriptions in the documentation.

[sourcery-ai]

Reviewer's Guide by Sourcery

This pull request removes outdated information from the documentation regarding the need to enable subscriptions, as the feature is now enabled by default.

No diagrams generated as the changes look simple and do not need a visual representation.

File-Level Changes

Change	Details	Files
Remove instructions for enabling subscriptions in Django URLs	Delete code snippet showing how to enable subscriptions in AsgiGraphQLView Remove explanation about enabling subscriptions in MyProject.urls.py	docs/guide/subscriptions.md

Possibly linked issues

• TypeError: GraphQLView() received an invalid keyword 'subscriptions_enabled'. as_view only accepts arguments that are already attributes of the class. #644: PR updates docs to reflect removal of 'subscriptions_enabled', addressing the issue's TypeError.
• Getting subscriptions running #375: PR updates docs to reflect subscriptions are enabled by default, addressing issue confusion.

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[sourcery-ai]

Hey @bellini666 - I've reviewed your changes - here's some feedback:

Overall Comments:

• Consider adding a brief note mentioning that subscriptions are now enabled by default, to provide context for the removal of this section and help users upgrading from older versions.

Here's what I looked at during the review

• 🟢 General issues: all looks good
• 🟢 Security: all looks good
• 🟢 Testing: all looks good
• 🟢 Complexity: all looks good
• 🟡 Documentation: 2 issues found

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 88.71%. Comparing base (5ff6250) to head (5c2b20c).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #645   +/-   ##
=======================================
  Coverage   88.71%   88.71%           
=======================================
  Files          41       41           
  Lines        3606     3606           
=======================================
  Hits         3199     3199           
  Misses        407      407           

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