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, 2 insertions, 2 deletions

diff --git a/src/encoding/xml/read.go b/src/encoding/xml/read.go
index ed4470f3eb..5a89d5f504 100644
--- a/src/encoding/xml/read.go
+++ b/src/encoding/xml/read.go
@@ -90,7 +90,7 @@ import (
 //   * An anonymous struct field is handled as if the fields of its
 //      value were part of the outer struct.
 //
-//   * A struct field with tag "-" is never unmarshalled into.
+//   * A struct field with tag "-" is never unmarshaled into.
 //
 // Unmarshal maps an XML element to a string or []byte by saving the
 // concatenation of that element's character data in the string or
@@ -142,7 +142,7 @@ func (d *Decoder) DecodeElement(v interface{}, start *StartElement) error {
 	return d.unmarshal(val.Elem(), start)
 }
 
-// An UnmarshalError represents an error in the unmarshalling process.
+// An UnmarshalError represents an error in the unmarshaling process.
 type UnmarshalError string
 
 func (e UnmarshalError) Error() string { return string(e) }