Outdated description in `library/dis.rst`

Documentation

In POP_JUMP_IF_NOT_NONE document and POP_JUMP_IF_NONE document, the part "This opcode is a pseudo-instruction, ..." is now incorrect as mentioned in the immediately following note.

Linked PRs

• gh-132668: Remove outdated description in library/dis.rst #132669
• [3.13] gh-132668: Remove outdated description of POP_JUMP_* instructions (GH-132669) #132680