docs: Fix typos in lsm_introduction.md

Eduardo Vasconcelosrequested to merge
vasconcedu/apparmor.net:fix-lsm-intro-typo into master

There are a few typos in docs/about/lsm_introduction.md. Fix them:

  • permision -> permission;
  • urces -> resources;
  • **hooks** , -> **hooks**,.

Also address a malformed redundancy in section "Major vs Minor LSMs" where the same remark about AppArmor and SELinux providing different approaches to MAC appears twice, apparently mistakenly.

Edited by Eduardo Vasconcelos

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