Typo fixes

[sulaiman-equivator-dev]

Update:

Another typo fixed in ./automated-testing/e2e-testing/recipes/postman-testing.md

Before:

it is often useful to know long certain functions of your application took.

After:

it is often useful to know how long certain functions of your application took.

[nyouens]

Thank you :)

[sulaiman-equivator-dev]

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