Rename Seq2 to Seq

TODO.txt

@@ -1,9 +1,7 @@
 Think about not requiring so much Pos() when making messages
 Think about changing "consume" to "commit"
-Rename Seq2 to Seq
 Document Seq
 Should MakeState be private now that there's Run?
 What's Megaparsec got that we ain't got?
-Add and benchmark naïve Seq
 chainl
 whitespace handling

internal/bindgen/seq.go.tmpl

@@ -1,7 +1,7 @@
 {{/* SPDX-License-Identifier: Unlicense */ -}}
 
 {{define "func"}}{{if gt . 1 -}}
-func Seq{{.}}[In, Out{{range .Count}}, T{{.}}{{end}} any](
+func Seq{{if gt . 2}}{{.}}{{end}}[In, Out{{range .Count}}, T{{.}}{{end}} any](
 	{{- range .Count}}
 	p{{.}} Parser[In, T{{.}}],{{end}}
 	f func({{range .Count}}{{if ne . 1}}, {{end}}T{{.}}{{end}}) Out,

seq.go

@@ -4,7 +4,7 @@
 
 package gigaparsec
 
-func Seq2[In, Out, T, T2 any](
+func Seq[In, Out, T, T2 any](
 	p Parser[In, T],
 	p2 Parser[In, T2],
 	f func(T, T2) Out,