fix some typos in documents (#1680)

* fix typo in models.md

* fix typo in crud.md: add lost double quotation

* fix markdown code highlight

* fix misunderstanding

documents/crud.md

@@ -665,7 +665,7 @@ func (user *User) BeforeSave(scope *gorm.Scope) (err error) {
 
 ```go
 // Add extra SQL option for updating SQL
-db.Model(&user).Set("gorm:update_option", "OPTION (OPTIMIZE FOR UNKNOWN)").Update("name, "hello")
+db.Model(&user).Set("gorm:update_option", "OPTION (OPTIMIZE FOR UNKNOWN)").Update("name", "hello")
 //// UPDATE users SET name='hello', updated_at = '2013-11-17 21:34:10' WHERE id=111 OPTION (OPTIMIZE FOR UNKNOWN);
 ```
 

documents/development.md

@@ -40,33 +40,41 @@ GORM itself is powered by `Callbacks`, so you could fully customize GORM as you
 
 ### Register a new callback
 
-    func updateCreated(scope *Scope) {
-        if scope.HasColumn("Created") {
-            scope.SetColumn("Created", NowFunc())
-        }
+```go
+func updateCreated(scope *Scope) {
+    if scope.HasColumn("Created") {
+        scope.SetColumn("Created", NowFunc())
     }
+}
 
-    db.Callback().Create().Register("update_created_at", updateCreated)
-    // register a callback for Create process
+db.Callback().Create().Register("update_created_at", updateCreated)
+// register a callback for Create process
+```
 
 ### Delete an existing callback
 
-    db.Callback().Create().Remove("gorm:create")
-    // delete callback `gorm:create` from Create callbacks
+```go
+db.Callback().Create().Remove("gorm:create")
+// delete callback `gorm:create` from Create callbacks
+```
 
 ### Replace an existing callback
 
-    db.Callback().Create().Replace("gorm:create", newCreateFunction)
-    // replace callback `gorm:create` with new function `newCreateFunction` for Create process
+```go
+db.Callback().Create().Replace("gorm:create", newCreateFunction)
+// replace callback `gorm:create` with new function `newCreateFunction` for Create process
+```
 
 ### Register callback orders
 
-    db.Callback().Create().Before("gorm:create").Register("update_created_at", updateCreated)
-    db.Callback().Create().After("gorm:create").Register("update_created_at", updateCreated)
-    db.Callback().Query().After("gorm:query").Register("my_plugin:after_query", afterQuery)
-    db.Callback().Delete().After("gorm:delete").Register("my_plugin:after_delete", afterDelete)
-    db.Callback().Update().Before("gorm:update").Register("my_plugin:before_update", beforeUpdate)
-    db.Callback().Create().Before("gorm:create").After("gorm:before_create").Register("my_plugin:before_create", beforeCreate)
+```go
+db.Callback().Create().Before("gorm:create").Register("update_created_at", updateCreated)
+db.Callback().Create().After("gorm:create").Register("update_created_at", updateCreated)
+db.Callback().Query().After("gorm:query").Register("my_plugin:after_query", afterQuery)
+db.Callback().Delete().After("gorm:delete").Register("my_plugin:after_delete", afterDelete)
+db.Callback().Update().Before("gorm:update").Register("my_plugin:before_update", beforeUpdate)
+db.Callback().Create().Before("gorm:create").After("gorm:before_create").Register("my_plugin:before_create", beforeCreate)
+```
 
 ### Pre-Defined Callbacks
 

documents/models.md

@@ -107,7 +107,7 @@ db.SingularTable(true) // if set this to true, `User`'s default table name will
 
 You can apply any rules on the default table name by defining the `DefaultTableNameHandler`
 
-```
+```go
 gorm.DefaultTableNameHandler = func (db *gorm.DB, defaultTableName string) string  {
 	return "prefix_" + defaultTableName;
 }