Add copy for JS Elyses Analytic Enchantments

analyzer-comments/javascript/elyses-analytic-enchantments/must_avoid_imperative_loop.md

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+# must avoid imperative loop
+
+Avoid use of for loops with this exercise.
+
+According to the introduction, there are built-in methods on the JavaScript Array object that are geared towards analysis.
+
+Take a look at the introduction and/or the [MDN docs](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array#instance_methods) on what methods are available to use.

analyzer-comments/javascript/general/prefer_built_in_method.md

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+# prefer built in method
+
+Make use of the built-in `${'method'}` method available on the `${'type'}` type.