fix: remove references to deprecated --experimental flag (sqlc-dev#2567)

resolves sqlc-dev#2566

Author: andrewmbenton

docs/guides/using-go-and-pgx.rst

@@ -66,7 +66,7 @@ Generating the code will now give you pgx-compatible database access methods.
 
 .. code-block:: bash
 
-   sqlc generate --experimental
+   sqlc generate
 
 ^^^^^^^^^^^^^^^^^^^^^^^^^^
 Generated code walkthrough

scripts/regenerate/main.go

@@ -55,7 +55,7 @@ func regenerate(dir string) error {
 				expectFailure = true
 			}
 
-			cmd := exec.Command("sqlc-dev", "generate", "--experimental")
+			cmd := exec.Command("sqlc-dev", "generate")
 			cmd.Dir = cwd
 			out, failed := cmd.CombinedOutput()
 			if failed != nil && !expectFailure {