Improve punctuation and sentence clarity in templates documentation

[AKSHAT MAKWANA]

Description

In the templates documentation, a sentence uses a comma where a semicolon would improve readability and separation of clauses.

Current text

"You can also write your own custom backend, see :doc:Custom template backend </howto/custom-template-backend>"

Proposed change

"You can also write your own custom backend; see :doc:Custom template backend </howto/custom-template-backend>."

Rationale

This improves grammatical correctness and clarity by properly separating independent clauses and ensuring correct punctuation.

I would be happy to submit a patch for this improvement.

[Jacob Walls]

Yes, it's a comma splice, but I read it as if there's an omitted ("e.g.") --> "You can foo, for example, see bar."

I don't think it's worth auditing. I'm sure there's instances all over.