Improve documentation writing

[LouisLeNezet]

During the review of the phaseimpute pipeline a few comments was done on portions of the documentation originating from the template.
Here is the improved documentation.

PR checklist

• This comment contains a description of changes (with reason)
• CHANGELOG.md is updated
• If you've fixed a bug or added code that should be tested, add tests!
• Documentation in docs is updated

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 75.79%. Comparing base (be5f2e2) to head (ac5497a).
Report is 9 commits behind head on dev.

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[mashehu]

Suggested change

The pipeline also dynamically loads configurations from [https://github.com/nf-core/configs](https://github.com/nf-core/configs) when it runs, making multiple config profiles for various institutional clusters available at run time. For more information and to check if your system is suported, please see the [nf-core/configs documentation](https://github.com/nf-core/configs#documentation).

The pipeline also dynamically loads configurations from [https://github.com/nf-core/configs](https://github.com/nf-core/configs) when it runs, making multiple config profiles for various institutional clusters available at run time. For more information and to check if your system is supported, please see the [nf-core/configs documentation](https://github.com/nf-core/configs#documentation).