all: fix "the the" typos.

LGTM=bradfitz
R=golang-codereviews, bradfitz
CC=golang-codereviews
https://golang.org/cl/93470043

doc/articles/wiki/index.html

@@ -466,7 +466,7 @@ header to the HTTP response.
 <p>
 The function <code>saveHandler</code> will handle the submission of forms
 located on the edit pages. After uncommenting the related line in
-<code>main</code>, let's implement the the handler:
+<code>main</code>, let's implement the handler:
 </p>
 
 {{code "doc/articles/wiki/final-template.go" `/^func saveHandler/` `/^}/`}}

src/cmd/gofmt/testdata/typeswitch.golden

@@ -4,7 +4,7 @@
 	into the correct unparenthesized form.
 
 	Only type-switches that didn't declare a variable
-	in the the type switch type assertion and which
+	in the type switch type assertion and which
 	contained only "expression-like" (named) types in their
 	cases were permitted to have their type assertion parenthesized
 	by go/parser (due to a weak predicate in the parser). All others

src/cmd/gofmt/testdata/typeswitch.input

@@ -4,7 +4,7 @@
 	into the correct unparenthesized form.
 
 	Only type-switches that didn't declare a variable
-	in the the type switch type assertion and which
+	in the type switch type assertion and which
 	contained only "expression-like" (named) types in their
 	cases were permitted to have their type assertion parenthesized
 	by go/parser (due to a weak predicate in the parser). All others

src/pkg/runtime/runtime-gdb.py

@@ -378,7 +378,7 @@ class GoroutinesCmd(gdb.Command):
 def find_goroutine(goid):
 	"""
 	find_goroutine attempts to find the goroutine identified by goid.
-	It returns a touple of gdv.Value's representing the the stack pointer
+	It returns a touple of gdv.Value's representing the stack pointer
 	and program counter pointer for the goroutine.
 
 	@param int goid