Docs: make prereq titles consistent

[chrisdoherty4]

The titles for most requirements pages had an additional # making them inconsistent with other pages under the same sections.

[chrisdoherty4]

/approve
/cherry-pick release-0.18

[eks-distro-pr-bot]

@chrisdoherty4: once the present PR merges, I will cherry-pick it on top of release-0.18 in a new PR and assign it to you.

In response to this:

/approve
/cherry-pick release-0.18

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[eks-distro-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: chrisdoherty4

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (80fc4e6) 71.76% compared to head (4dcefa5) 71.76%.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #7035   +/-   ##
=======================================
  Coverage   71.76%   71.76%           
=======================================
  Files         532      532           
  Lines       41627    41627           
=======================================
  Hits        29873    29873           
  Misses      10078    10078           
  Partials     1676     1676           

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[eks-distro-pr-bot]

@chrisdoherty4: new pull request created: #7059

In response to this:

/approve
/cherry-pick release-0.18

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.