Fix the tiny doc descriptions (pytorch#147319)

As the title stated
Pull Request resolved: pytorch#147319
Approved by: https://github.com/zou3519

Author: fffrog

torch/_library/triton.py

@@ -40,7 +40,7 @@ def triton_op(
 
     Note that ``fn`` must only consist of calls to PyTorch-understood
     operators and triton kernels. Any triton kernels called inside ``fn``
-    must be wrapped in a call to :func:`torch._library.wrap_triton``.
+    must be wrapped in a call to :func:`torch.library.wrap_triton`.
 
     Args:
         name (str): A name for the custom op that looks like "{namespace}::{name}",