all: spell "marshal" and "unmarshal" consistently

The tree is inconsistent about single l vs double l in those
words in documentation, test messages, and one error value text.

	$ git grep -E '[Mm]arshall(|s|er|ers|ed|ing)' | wc -l
	      42
	$ git grep -E '[Mm]arshal(|s|er|ers|ed|ing)' | wc -l
	    1694

Make it consistently a single l, per earlier decisions. This means
contributors won't be confused by misleading precedence, and it helps
consistency.

Change the spelling in one error value text in newRawAttributes of
crypto/x509 package to be consistent.

This change was generated with:

	perl -i -npe 's,([Mm]arshal)l(|s|er|ers|ed|ing),$1$2,' $(git grep -l -E '[Mm]arshall' | grep -v AUTHORS | grep -v CONTRIBUTORS)

Updates #12431.
Follows https://golang.org/cl/14150.

Change-Id: I85d28a2d7692862ccb02d6a09f5d18538b6049a2
Reviewed-on: https://go-review.googlesource.com/33017
Run-TryBot: Minux Ma <minux@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/encoding/xml/read_test.go b/src/encoding/xml/read_test.go
index b53d72c716..273c303d16 100644
--- a/src/encoding/xml/read_test.go
+++ b/src/encoding/xml/read_test.go
@@ -705,7 +705,7 @@ func TestUnmarshalIntoInterface(t *testing.T) {
 	}
 	pea, ok := pod.Pea.(*Pea)
 	if !ok {
-		t.Fatalf("unmarshalled into wrong type: have %T want *Pea", pod.Pea)
+		t.Fatalf("unmarshaled into wrong type: have %T want *Pea", pod.Pea)
 	}
 	have, want := pea.Cotelydon, "Green stuff"
 	if have != want {