Update about-this-handbook.md

[msiyer]

1. Starting positively is important: describing the purpose of the handbook is more important.
2. Sentence describing what not to expect from the handbook has been moved to a better place. This can even be turned into a callout.
3. Consistency: replaced the word document with handbook.
4. Grammar edits: a) a comma must precede "and" that joins two independent clauses; b) article usage.

[Vaelatern]

Counter argument: Describing the negative purpose of the handbook, "This is NOT," is also important. If it goes anywhere later than the first sentence, fewer people will read it.

[msiyer]

Counter argument: Describing the negative purpose of the handbook, "This is NOT," is also important. If it goes anywhere later than the first sentence, fewer people will read it.

It is definitely important. This is the reason I proposed turning "This is NOT" into a "warning" callout.
However, "This is NOT" should not be the first sentence. The purpose must be the first sentence.

[msiyer]

@Vaelatern do you think the changes add value? should i add the callout for "This is NOT", make all checks successful, and commit again?

[tranzystorekk]

These changes feel mostly stylistic, without any substantial addition or correction. Unless there's some additional value I'm missing, it doesn't seem worth to include them.

[ahesford]

Adding "an" in the "Example Commands" section changes the meaning of the sentence and is not correct.

Given the number of people who approach the documentation (and the IRC channel) expecting remedial Linux tutorials, emphasis that this guide is not intended to provide such content deserves top billing.

[msiyer]

sure guys. whatever floats your boat.