sql_examples.md: fix commands
create table "friends_of_peppa" (
"id" integer,
"name" text not null,
primary key ("id")
) using memtx distributed by ("id")
option (timeout = 3.0)
sbroad: invalid column: Primary key mustn''t contain nullable columns
insert into "friends_of_peppa" ("id", "name") values (1, "Suzy")
sbroad: relational (id 5) not found
Staging: https://docs.binary.picodata.io/picodata/branch-rosik/fix-sql-examples/
Edited by Yaroslav Dynnikov