typo fixes found by @niftynei

Also, put the "added" lines in the request schemas for new commands:
this doesn't do anything (yet?) but it keeps `make schema-added-check` happy.

Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>

doc/schemas/listsqlschemas.request.json

@@ -2,6 +2,7 @@
   "$schema": "http://json-schema.org/draft-07/schema#",
   "type": "object",
   "required": [],
+  "added": "v23.02",
   "properties": {
     "table": {
       "type": "string"

doc/schemas/listsqlschemas.schema.json

@@ -33,7 +33,7 @@
               "properties": {
                 "name": {
                   "type": "string",
-                  "description": "the name the column"
+                  "description": "the name of the column"
                 },
                 "type": {
                   "type": "string",

doc/schemas/sql.request.json

@@ -4,6 +4,7 @@
   "required": [
     "query"
   ],
+  "added": "v23.02",
   "properties": {
     "query": {
       "type": "string"