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• Remove outdated instructions for enabling subscriptions in the documentation.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[bot]]

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This pull request removes outdated information from the documentation regarding the need to enable subscriptions, as the feature is now enabled by default.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

• #644: PR updates docs to reflect removal of 'subscriptions_enabled', addressing the issue's TypeError.
• #375: PR updates docs to reflect subscriptions are enabled by default, addressing issue confusion.

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[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

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

Additional details and impacted files

```diff @@ 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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