text/template,html/template: correct comment in DefinedTemplates

The prefix includes a semicolon.

Change-Id: I4bdb79aa9931e835e297f3ea2c46a001cd123d56
Reviewed-on: https://go-review.googlesource.com/17200Reviewed-by: Andrew Gerrand <adg@golang.org>

src/html/template/template.go

@@ -144,7 +144,7 @@ func (t *Template) lookupAndEscapeTemplate(name string) (tmpl *Template, err err
 }
 
 // DefinedTemplates returns a string listing the defined templates,
-// prefixed by the string "defined templates are: ". If there are none,
+// prefixed by the string "; defined templates are: ". If there are none,
 // it returns the empty string. Used to generate an error message.
 func (t *Template) DefinedTemplates() string {
 	return t.text.DefinedTemplates()

src/text/template/exec.go

@@ -180,7 +180,7 @@ func (t *Template) Execute(wr io.Writer, data interface{}) (err error) {
 }
 
 // DefinedTemplates returns a string listing the defined templates,
-// prefixed by the string "defined templates are: ". If there are none,
+// prefixed by the string "; defined templates are: ". If there are none,
 // it returns the empty string. For generating an error message here
 // and in html/template.
 func (t *Template) DefinedTemplates() string {