docs: apply reviewed wiki editorial corrections
docs: improve Web SDK documentation style
docs: refine Web SDK requests and behavior guidance
docs: correct Web SDK PIN length and custom card format export docs - State that the Web SDK enforces both the 16-digit maximum and the configured minimum PIN length. - Remove the non-existent /customCardFormats/export* routes from the custom card formats guide and the endpoint reference.
docs: split web-sdk-reference into endpoints, constants, and enumerations pages