all: fix some function names and typos in comment

Change-Id: I8066b22cb87e09fb160de3b8ff2d8fdde6ec3dcf
Reviewed-on: https://go-review.googlesource.com/c/tools/+/675815
Reviewed-by: David Chase <drchase@google.com>
Auto-Submit: Alan Donovan <adonovan@google.com>
Reviewed-by: Alan Donovan <adonovan@google.com>
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>

jsonschema/resolve_test.go

@@ -132,7 +132,7 @@ func TestResolveURIs(t *testing.T) {
 
 func TestRefCycle(t *testing.T) {
 	// Verify that cycles of refs are OK.
-	// The test suite doesn't check this, suprisingly.
+	// The test suite doesn't check this, surprisingly.
 	schemas := map[string]*Schema{
 		"root": {Ref: "a"},
 		"a":    {Ref: "b"},