docs: remove substitution in AES keygen examples

[super-octo-spoon]

What does it do ?

This removes the substitution that replaces + and / to - and _ respectively from the documentation for example to generate AES (base64 encoded) encryption keys.

Motivation

After testing these commands while wanting to introduce it, there was cases in which the commands effectively used the substitution. Go's base64.StdEncoding.DecodeString method does not want these substitutions, hence the keys will not work and ExternalDNS won't start.

As mentioned in #5684; not sure if there was a reasoning behind this substitution.

Considering not every generation of a key with those commands result in the substitution being triggered, some generated keys effectively worked hence it may have been overlooked.

More

• Yes, this PR title follows Conventional Commits
• Yes, I added unit tests
• Yes, I updated end user documentation accordingly

[linux-foundation-easycla]

• ✅login: fkaiegl / (7eef1bf)

The committers listed above are authorized under a signed CLA.

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[ivankatliarchuk]

/ok-to-test

[ivankatliarchuk]

/lgtm

[mloiseleur]

/approve

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