[release-branch.go1.21] runtime: fix Pinner.Pin documentation

Fixes #63768

Change-Id: I01a9bb8f9af22a6b3f6534d431e3ea623875ed48
GitHub-Last-Rev: 7c5dd4e
GitHub-Pull-Request: #64920
Reviewed-on: https://go-review.googlesource.com/c/go/+/553395
Reviewed-by: Michael Knyszek <[email protected]>
Auto-Submit: Michael Knyszek <[email protected]>
Reviewed-by: Cherry Mui <[email protected]>
LUCI-TryBot-Result: Go LUCI <[email protected]>
TryBot-Result: Gopher Robot <[email protected]>

Author: qiulaidongfeng

src/runtime/pinner.go

@@ -25,10 +25,7 @@ type Pinner struct {
 // objects, these objects must be pinned separately if they are going to be
 // accessed from C code.
 //
-// The argument must be a pointer of any type or an
-// unsafe.Pointer. It must be the result of calling new,
-// taking the address of a composite literal, or taking the address of a
-// local variable. If one of these conditions is not met, Pin will panic.
+// The argument must be a pointer of any type or an unsafe.Pointer.
 func (p *Pinner) Pin(pointer any) {
 	if p.pinner == nil {
 		// Check the pinner cache first.