Fix typo in comment (NFC)

internal/binutils/addr2liner.go

 
 // newAddr2liner starts the given addr2liner command reporting
 // information about the given executable file. If file is a shared
-// library, base should be the address at which is was mapped in the
+// library, base should be the address at which it was mapped in the
 // program under consideration.
 func newAddr2Liner(cmd, file string, base uint64) (*addr2Liner, error) {
 	if cmd == "" {

internal/binutils/addr2liner_llvm.go

 
 // newLlvmSymbolizer starts the given llvmSymbolizer command reporting
 // information about the given executable file. If file is a shared
-// library, base should be the address at which is was mapped in the
+// library, base should be the address at which it was mapped in the
 // program under consideration.
 func newLLVMSymbolizer(cmd, file string, base uint64) (*llvmSymbolizer, error) {
 	if cmd == "" {

internal/binutils/addr2liner_nm.go

 
 //  newAddr2LinerNM starts the given nm command reporting information about the
 // given executable file. If file is a shared library, base should be
-// the address at which is was mapped in the program under
+// the address at which it was mapped in the program under
 // consideration.
 func newAddr2LinerNM(cmd, file string, base uint64) (*addr2LinerNM, error) {
 	if cmd == "" {