Missing documentation for `SEND_GEN` opcode for `dis` module

[ShaharNaveh]

Under General instructions https://docs.python.org/3.14/library/dis.html#opcode-NOP there is a list of all available opcodes and a description of what they do and what oparg they have (if any). but for some reason SEND_GEN isn't mentioned anywhere in the documentation

Linked PRs

• gh-140205: Add a description of SEND_GEN to the dis module. #140372

[corona10]

SEND_GEN is specialized opcode, we don't document for it.
cc @Fidget-Spinner