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Fixed an atrocious typo in the description of the
`frobenius_endomorphism` method of the class `DrinfeldModule_finite`.

I followed the notation (the degree of `K` over `\mathbb F_q` is denoted
by `n`) chosen by Xavier @xcaruso in his PR on homsets of Drinfeld
modules (sagemath#40440).

### 📝 Checklist

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### ⌛ Dependencies

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None.

URL: sagemath#40575
Reported by: Antoine Leudière
Reviewer(s):

<!-- ^ Please provide a concise and informative title. -->
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to calculate 1 + 2". -->
<!-- v Describe your changes below in detail. -->
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example, "Fixes sagemath#12345". -->

Fixed an atrocious typo in the description of the
`frobenius_endomorphism` method of the class `DrinfeldModule_finite`.

I followed the notation (the degree of `K` over `\mathbb F_q` is denoted
by `n`) chosen by Xavier @xcaruso in his PR on homsets of Drinfeld
modules (sagemath#40440).

### 📝 Checklist

<!-- Put an `x` in all the boxes that apply. -->

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- [x] The description explains in detail what this PR is about.
- [ ] I have linked a relevant issue or discussion.
- [ ] I have created tests covering the changes.
- [x] I have updated the documentation and checked the documentation
preview.

### ⌛ Dependencies

<!-- List all open PRs that this PR logically depends on. For example,
-->
<!-- - sagemath#12345: short description why this is a dependency -->
<!-- - sagemath#34567: ... -->

None.

URL: sagemath#40575
Reported by: Antoine Leudière
Reviewer(s):

<!-- ^ Please provide a concise and informative title. -->
<!-- ^ Don't put issue numbers in the title, do this in the PR
description below. -->
<!-- ^ For example, instead of "Fixes sagemath#12345" use "Introduce new method
to calculate 1 + 2". -->
<!-- v Describe your changes below in detail. -->
<!-- v Why is this change required? What problem does it solve? -->
<!-- v If this PR resolves an open issue, please link to it here. For
example, "Fixes sagemath#12345". -->

Fixed an atrocious typo in the description of the
`frobenius_endomorphism` method of the class `DrinfeldModule_finite`.

I followed the notation (the degree of `K` over `\mathbb F_q` is denoted
by `n`) chosen by Xavier @xcaruso in his PR on homsets of Drinfeld
modules (sagemath#40440).

### 📝 Checklist

<!-- Put an `x` in all the boxes that apply. -->

- [x] The title is concise and informative.
- [x] The description explains in detail what this PR is about.
- [ ] I have linked a relevant issue or discussion.
- [ ] I have created tests covering the changes.
- [x] I have updated the documentation and checked the documentation
preview.

### ⌛ Dependencies

<!-- List all open PRs that this PR logically depends on. For example,
-->
<!-- - sagemath#12345: short description why this is a dependency -->
<!-- - sagemath#34567: ... -->

None.

URL: sagemath#40575
Reported by: Antoine Leudière
Reviewer(s):

sagemathgh-40440: Hom spaces between Drinfeld modules
    
We implement a method for computing a basis of the homset between two
Drinfeld modules defined over a finite field.

Includes sagemath#35386

### 📝 Checklist

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- [ ] I have linked a relevant issue or discussion.
- [x] I have created tests covering the changes.
- [x] I have updated the documentation and checked the documentation
preview.

### ⌛ Dependencies

sagemath#40430, sagemath#40436
    
URL: sagemath#40440
Reported by: Xavier Caruso
Reviewer(s): Antoine Leudière, Xavier Caruso