[ios, macos] Revamp predicate and expression guide (#11741)

* [ios, macos] Fact-checked expression guide

Corrected various factual inaccuracies in the “Predicates and Expressions” guide. Moved some explanation from the predicates section to the expressions section. Added sections for all the other expression types we support.

* [ios, macos] Reorganized custom function documentation

Reorganized the custom function documentation as a series of sections with headers and definition lists instead of a monolithic table. Copyedited various sections for accuracy. Linked references to custom functions. Added format string examples for all custom functions.

* [ios, macos] Made h3 more visible

* [ios, macos] Added Objective-C example of placeholders

* [ios, macos] Documented trig functions

* [ios, macos] Also increase h3 code size

* [ios, macos] Replaced Markdown with HTML in definition

* [ios, macos] Replaced Markdown with HTML in custom function documentation

* [ios, macos] Clarified stops

* [ios, macos] Cross-referenced functions

Each custom function definition cross-references the corresponding aftermarket function (or vice versa), the corresponding style specification expression operator, and any related NSExpression syntax.

* [ios, macos] Fixed links in predicate guide

* [ios, macos] Consolidated and documented NSExpression categories

Consolidated the NSExpression categories into a single category, with marks to separate different tasks. Documented the MGLAdditions category so that it shows up in the jazzy documentation.

* [ios, macos] Fixed NSExpression private category mixup

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