Update array-operators.md - #1698

jason (@drvoss)
This doesn't look quite right. Normally, we reserve bold styling for language keywords and UI elements. In this case, since the descriptions aren't complete sentences, it's hard to tell if Array is being used in a generic sense or as a type. If it's the type, the preferred style is array, written in markdown wrapped in `back-ticks`. If it's generic, then array should be unstyled.

The best solution might be to turn these descriptions into sentences, so it's easy to tell. For example:

Operator <=

A non-member operator function that lexicographically compares the contents of two array objects. It returns true if the left argument compares as less than or equal to the right argument.