Duplicate Constant sections in api reference

[JCash]

In e.g. render api documentation, the "Constants" section has VERY large text.

Also, I think there is a slight naming discrepancy (Function/Functions, Constant/Constants) which could be fixed at the same time.

Suggested actions:

• Rename "Constant" section to "Constants"
• Rename "Function" section to "Functions"
• Decrease the size of the constants in the verbose "Constants" section.