docs(skills): fix two surviving CR 614.16 miscites for as-enters choices

[matthewevans]

CR 614.16 is the token/counter-creation replacement rule. As-enters effects
are CR 614.1c; the choice-before-entering timing is CR 614.12a (both
grep-verified against docs/MagicCompRules.txt). PR #5816 corrected one
instance of this miscite but these two predated it in a different format.

[gemini-code-assist]

Code Review

This pull request updates the Magic Comprehensive Rules (CR) citations in the replacement effect skill documentation (SKILL.md), correcting references to "as enters" choices to use CR 614.1c + 614.12a and CR 614.12a instead of CR 614.16. The review feedback suggests extending this correction to line 104 for consistency across the document, ensuring all references to these rules are fully and accurately cited.

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[gemini-code-assist]

For consistency with the main "Interactive Replacements" section (line 202) and the table summary (line 22), consider citing both CR 614.1c and CR 614.12a here. CR 614.1c establishes that "as enters" effects are replacement effects, which is the foundation for the choice timing rule in CR 614.12a that this sentence highlights.

Suggested change

	**For effects that must happen *before* the zone change** (like "choose a basic land type" — CR 614.12a), see Interactive Replacements below. Those pause the pipeline mid-flight rather than using the post-delivery lifecycle.
	**For effects that must happen *before* the zone change** (like "choose a basic land type" — CR 614.1c + 614.12a), see Interactive Replacements below. Those pause the pipeline mid-flight rather than using the post-delivery lifecycle.