[llvm] [Docs] Update Opt's Option to Specify Pass Pipeline (NFC) (PR #148402)

[Nikita Popov via llvm-commits]

================
@@ -46,12 +46,13 @@ OPTIONS
 
  Write output in LLVM intermediate language (instead of bitcode).
 
-.. option:: -{passname}
+.. option:: --passes=<string>
----------------
nikic wrote:

```suggestion
.. option:: -passes=<string>
```


https://github.com/llvm/llvm-project/pull/148402