ssa: fix typo in doc comment for Program.FuncValue

Change-Id: I0828d0a7265d1e7c4f8c7a17832357826fbdfcfc
Reviewed-on: https://go-review.googlesource.com/c/tools/+/643575
Auto-Submit: Alan Donovan <[email protected]>
Commit-Queue: Ian Lance Taylor <[email protected]>
Reviewed-by: Alan Donovan <[email protected]>
Auto-Submit: Ian Lance Taylor <[email protected]>
Reviewed-by: Ian Lance Taylor <[email protected]>
LUCI-TryBot-Result: Go LUCI <[email protected]>

Author: merrickclay

go/ssa/source.go

@@ -191,7 +191,7 @@ func (prog *Program) packageLevelMember(obj types.Object) Member {
 }
 
 // FuncValue returns the SSA function or (non-interface) method
-// denoted by the specified func symbol. It returns nil id the symbol
+// denoted by the specified func symbol. It returns nil if the symbol
 // denotes an interface method, or belongs to a package that was not
 // created by prog.CreatePackage.
 func (prog *Program) FuncValue(obj *types.Func) *Function {