[DOC] Fix typos, misspellings & capitalizations in doctrings

[nimanzik]

Reference Issues/PRs

What does this implement/fix? Explain your changes.

Typos, misspellings and sentence capitalization in the docstrings have been fixed. The docstring of the main classes in the transformations/collection/convolution_based module (e.g. Rocket, MiniRocket, ...) have been modified in this PR.

Does your contribution introduce a new dependency? If yes, which one?

No

Any other comments?

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I have added the following labels to this PR based on the title: [ $\color{#F3B9F8}{\textsf{documentation}}$ ].
I have added the following labels to this PR based on the changes made: [ $\color{#41A8F6}{\textsf{transformations}}$ ]. Feel free to change these if they do not properly represent the PR.

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[TonyBagnall]

LGTM

[TonyBagnall]

@all-contributors add @nimanzik for docs

[allcontributors]

@TonyBagnall

I've put up a pull request to add @nimanzik! 🎉