fix: typos in spec

Author: repomaa

db_spec/sqlite3/repository/exec_spec.cr

@@ -1,7 +1,7 @@
 require "../sqlite3_spec"
 require "../../repository_spec"
 
-describe "Repository(Postgres)#exec" do
+describe "Repository(Sqlite3)#exec" do
   repo = repo(:sqlite3)
 
   describe "with SQL" do

db_spec/sqlite3/repository/query_spec.cr

@@ -2,7 +2,7 @@ require "../sqlite3_spec"
 require "../../repository_spec"
 require "../models"
 
-describe "Repository(Postgres)#query" do
+describe "Repository(Sqlite3)#query" do
   repo = repo(:sqlite3)
 
   # This is John

db_spec/sqlite3/repository/scalar_spec.cr

@@ -1,7 +1,7 @@
 require "../sqlite3_spec"
 require "../../repository_spec"
 
-describe "Repository(Postgres)#scalar" do
+describe "Repository(Sqlite3)#scalar" do
   repo = repo(:sqlite3)
 
   describe "with SQL" do