fix: typos in documentation files

[leopardracer]

This pull request contains changes to improve clarity, correctness and structure.

Description correction: Corrected "gitub-mgmt" to "GitHub-mgmt". Corrected "expecations" to "expectations". Corrected "insallations" to "installations". Corrected "Confrim" to "Confirm". Corrected "modifes" to "modifies". Corrected "worfklows" to "workflows".

Please review the changes and let me know if any additional changes are needed.

[github-actions[bot]]

The following access changes will be introduced as a result of applying the plan:

Access Changes

``` There will be no access changes ```

[github-actions[bot]]

Before merge, verify that all the following plans are correct. They will be applied as-is after the merge.

Terraform plans

filecoin-project

``` No changes. Your infrastructure matches the configuration. Terraform has compared your real infrastructure against your configuration and found no differences, so no changes are needed. ```

[leopardracer]

@Stebalien Hi, Is everything okay or do I need to fix something?

[Stebalien]

Sorry, I thought this was a PR against a different repo.