Fix some typos

[ilaborie]

While looking at the code, I saw some typos, this PR is just to correct them.
I didn't see any rules about deprecations, so here are the choices I made:

• I corrected typos in the comments, including in the changelog.
• for the code, I tried to preserve the api by using #[deprecated]
• for crates/fluvio-cli/src/topic/create.rs I did not put the #[deprecated] because the CreateTopicOpt is created by the clap parser
• for crates/fluvio-dataplane-protocol/src/error_code.rs because two variants can't share the same tag (derive Encoder/Decoder)
• Be careful with crates/fluvio-sc/src/k8/controllers/mod.rs, I don't know the consequences of the correction

Also I don't know if I should rename crates/fluvio-protocol/src/core/varint.rs to variant.rs?

[sehz]

Good catch. Thanks

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