all: fix typos

LGTM=bradfitz
R=golang-codereviews, bradfitz
CC=golang-codereviews
https://golang.org/cl/88670043

src/pkg/archive/tar/reader.go

@@ -334,7 +334,7 @@ func parsePAX(r io.Reader) (map[string]string, error) {
 			return nil, ErrHeader
 		}
 		// Extract everything between the decimal and the n -1 on the
-		// beginning to to eat the ' ', -1 on the end to skip the newline.
+		// beginning to eat the ' ', -1 on the end to skip the newline.
 		var record []byte
 		record, buf = buf[sp+1:n-1], buf[n:]
 		// The first equals is guaranteed to mark the end of the key.

src/pkg/container/list/example_test.go

@@ -17,7 +17,7 @@ func Example() {
 	l.InsertBefore(3, e4)
 	l.InsertAfter(2, e1)
 
-	// Iterate through list and and print its contents.
+	// Iterate through list and print its contents.
 	for e := l.Front(); e != nil; e = e.Next() {
 		fmt.Println(e.Value)
 	}

src/pkg/crypto/cipher/benchmark_test.go

@@ -47,7 +47,7 @@ func BenchmarkAESGCMOpen1K(b *testing.B) {
 }
 
 // If we test exactly 1K blocks, we would generate exact multiples of
-// the cipher's block size, and and the cipher stream fragments would
+// the cipher's block size, and the cipher stream fragments would
 // always be wordsize aligned, whereas non-aligned is a more typical
 // use-case.
 const almost1K = 1024 - 5

src/pkg/debug/goobj/read.go

@@ -188,7 +188,7 @@ type Var struct {
 
 // Func contains additional per-symbol information specific to functions.
 type Func struct {
-	Args     int        // size in bytes of of argument frame: inputs and outputs
+	Args     int        // size in bytes of argument frame: inputs and outputs
 	Frame    int        // size in bytes of local variable frame
 	Leaf     bool       // function omits save of link register (ARM)
 	Var      []Var      // detail about local variables

src/pkg/encoding/base32/base32.go

@@ -266,7 +266,7 @@ func (enc *Encoding) decode(dst, src []byte) (n int, end bool, err error) {
 				// 7, 5 and 2 are not valid padding lengths, and so 1, 3 and 6 are not
 				// valid dlen values. See RFC 4648 Section 6 "Base 32 Encoding" listing
 				// the five valid padding lengths, and Section 9 "Illustrations and
-				// Examples" for an illustration for how the the 1st, 3rd and 6th base32
+				// Examples" for an illustration for how the 1st, 3rd and 6th base32
 				// src bytes do not yield enough information to decode a dst byte.
 				if dlen == 1 || dlen == 3 || dlen == 6 {
 					return n, false, CorruptInputError(olen - len(src) - 1)

src/pkg/mime/multipart/quotedprintable_test.go

@@ -131,7 +131,7 @@ func TestQPExhaustive(t *testing.T) {
 					return
 				}
 				if strings.HasSuffix(errStr, "0x0a") || strings.HasSuffix(errStr, "0x0d") {
-					// bunch of cases; since whitespace at the end of of a line before \n is removed.
+					// bunch of cases; since whitespace at the end of a line before \n is removed.
 					return
 				}
 			}

src/pkg/net/http/client_test.go

@@ -987,7 +987,7 @@ func TestClientTrailers(t *testing.T) {
 		// TODO: golang.org/issue/7759: there's no way yet for
 		// the server to set trailers without hijacking, so do
 		// that for now, just to test the client.  Later, in
-		// Go 1.4, it should be be implicit that any mutations
+		// Go 1.4, it should be implicit that any mutations
 		// to w.Header() after the initial write are the
 		// trailers to be sent, if and only if they were
 		// previously declared with w.Header().Set("Trailer",

src/pkg/time/format.go

@@ -102,7 +102,7 @@ const (
 // std0x records the std values for "01", "02", ..., "06".
 var std0x = [...]int{stdZeroMonth, stdZeroDay, stdZeroHour12, stdZeroMinute, stdZeroSecond, stdYear}
 
-// startsWithLowerCase reports whether the the string has a lower-case letter at the beginning.
+// startsWithLowerCase reports whether the string has a lower-case letter at the beginning.
 // Its purpose is to prevent matching strings like "Month" when looking for "Mon".
 func startsWithLowerCase(str string) bool {
 	if len(str) == 0 {