More improvements to 'Moving around' chapter

[NotTheDr01ds]

Continuing the general clean-up of this chapter that I started when adding the "multi-dot" info.

• General grammar and wording tweaks - In general, tried to remove prepositions, especially "we" (but not all), and focus more on what Nushell does. This involves the use of more passive voice, but I hope it reads more professionally in most cases.
• Linked to other sections to reduce redundancy
• Removed the wording about Nushell passing globs "as is" to commands, since this only applies to internals, not externals. Also it was quite out-of-date, since all applicable filesystem commands now accept ...rest
• Added raw strings as a valid glob-escaping method
• Clarified the explanation/example of why backticks don't escape globs
• Likewise, the "string to glob" conversion was outdated due to the ...rest changes
• Removed the examples from the cp, mv, etc. commands since they are already linked to the command help itself, and these already include better and more complete examples.
• Other improvements

[NotTheDr01ds]

@fdncred You're right - That's what I say in the comment, but then the code example isn't what I thought I put there. Let me see what went wrong, but I definitely will push a fix for that in a moment.

[fdncred]

Thanks