go/types/objectpath: minor doc fix

Correct a typo in the objectpath documentation.

Change-Id: I85958d2529c6254466103738827ce3899d476b0b
Reviewed-on: https://go-review.googlesource.com/c/tools/+/334309
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Trust: Cherry Mui <cherryyz@google.com>
Run-TryBot: Robert Findley <rfindley@google.com>
gopls-CI: kokoro <noreply+kokoro@google.com>
TryBot-Result: Go Bot <gobot@golang.org>
diff --git a/go/types/objectpath/objectpath.go b/go/types/objectpath/objectpath.go
index cffd7ac..81e8fdc 100644
--- a/go/types/objectpath/objectpath.go
+++ b/go/types/objectpath/objectpath.go
@@ -58,7 +58,7 @@
 // - The only OT operator is Object.Type,
 //   which we encode as '.' because dot cannot appear in an identifier.
 // - The TT operators are encoded as [EKPRU].
-// - The OT operators are encoded as [AFMO];
+// - The TO operators are encoded as [AFMO];
 //   three of these (At,Field,Method) require an integer operand,
 //   which is encoded as a string of decimal digits.
 //   These indices are stable across different representations