Draft: Added in various missing alternative mobs to slayer tasks.

What have you done in this MR?

Added in more alternative enemies for slayer tasks. Removed non-combat NPCs from lists. Fixed some spelling errors in the file.

https://runescape.wiki/w/Slayer_substitutes?direction=prev&oldid=2137247

Are there any tricky things testers should keep an eye out for?

• No

Not really anything to test.

• Yes, as follows:
• I have tested these changes thoroughly.
• This requires extra testing due to changes to architecture or other similarly risky changes.
• I used the Thanos Tool for any JSON edits where possible, and have attached screenshots of any changes.
• I acknowledge that this contribution will be released under the AGPL license.

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