[PTO][Parser] record_event/wait_event docs use pipe_event_type but implementation expects sync_op_type

[WenboCodes]

Problem

Docs use #pto.pipe_event_type<...>, but implementation defines and consumes #pto.sync_op_type<...>.

Evidence

• Docs:
  • docs/PTO_IR_manual.md:185
  • docs/PTO_IR_manual.md:4763
  • docs/PTO_IR_manual.md:4799
• Impl:
  • include/PTO/IR/PTOAttrs.td:149 (sync_op_type)
  • include/PTO/IR/PTOOps.td:1293, include/PTO/IR/PTOOps.td:1310

Repro

Docs-style attribute:

pto.record_event [#pto.pipe_event_type<TLOAD>, #pto.pipe_event_type<TVEC>, #pto.event<EVENT_ID0>]

Parser error:
unknown attribute 'pipe_event_type' in dialect 'pto'

Expected behavior

Decide canonical sync attribute naming and align docs/parser/tests.

Acceptance criteria

• Canonical attribute syntax documented.
• Parser/docs/examples use same naming.
• lit parser regression for record/wait event syntax.