Fix inconsistent custom format documentation #438
Merged
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Prior to this commit, the documentation for setting a custom Format was inconsistently mixing module-level and instance-level method definitions.
There isn't existing precedent in the documentation for how to declare custom formats that share behavior with first-party formats (like xml and json). Since the test suite utilizes a
class-based approach (rather than amodule-based one), change theBasedocumentation to follow that precedent.