Fix typos discovered by codespell

[cclauss]

Thank you for submitting a Pull Request to the Mobile Security Testing Guide. Please make sure that:

• Your contribution is written in the 2nd person (e.g. you)
• Your contribution is written in an active present form for as much as possible.
• You have made sure that the reference section is up to date (e.g. please add sources you have used, make sure that the references to MITRE/MASVS/etc. are up to date)
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If your PR is related to an issue. Please end your PR test with the following line:
This PR closes #< insert number here >.

codespell --ignore-words-list=ba,compliancy,firt,ist,keypair,ligh,ser,synopsys,zuser
https://pypi.org/project/codespell/

[cpholguera]

Thank you so much @cclauss, this is very helpful! I'll see if we can integrate it in our GitHub workflows so that we catch them automatically in the future. Thanks for sharing the line as well!