Fix SQL syntax for comments, correct some typos.

structure.sql

 CREATE TABLE IF NOT EXISTS `user` (
   `id` bigint COMMENT 'Unique user identifier',
-  `first_name` CHAR(255) NOT NULL DEFAULT '' COMMENT 'User\'s first name',
-  `last_name` CHAR(255) DEFAULT NULL COMMENT 'User\'s last name',
-  `username` CHAR(255) DEFAULT NULL COMMENT 'User\'s username',
-  `language_code` CHAR(10) DEFAULT NULL COMMENT 'User\'s system language',
+  `first_name` CHAR(255) NOT NULL DEFAULT '' COMMENT 'User''s first name',
+  `last_name` CHAR(255) DEFAULT NULL COMMENT 'User''s last name',
+  `username` CHAR(255) DEFAULT NULL COMMENT 'User''s username',
+  `language_code` CHAR(10) DEFAULT NULL COMMENT 'User''s system language',
   `created_at` timestamp NULL DEFAULT NULL COMMENT 'Entry date creation',
   `updated_at` timestamp NULL DEFAULT NULL COMMENT 'Entry date update',
 
@@ -55,7 +55,7 @@ CREATE TABLE IF NOT EXISTS `chosen_inline_result` (
   `id` bigint UNSIGNED AUTO_INCREMENT COMMENT 'Unique identifier for this entry',
   `result_id` CHAR(255) NOT NULL DEFAULT '' COMMENT 'Identifier for this result',
   `user_id` bigint NULL COMMENT 'Unique user identifier',
-  `location` CHAR(255) NULL DEFAULT NULL COMMENT 'Location object, user\'s location',
+  `location` CHAR(255) NULL DEFAULT NULL COMMENT 'Location object, user''s location',
   `inline_message_id` CHAR(255) NULL DEFAULT NULL COMMENT 'Identifier of the sent inline message',
   `query` TEXT NOT NULL COMMENT 'The query that was used to obtain the result',
   `created_at` timestamp NULL DEFAULT NULL COMMENT 'Entry date creation',
@@ -90,15 +90,15 @@ CREATE TABLE IF NOT EXISTS `message` (
   `location` TEXT COMMENT 'Location object. Message is a shared location, information about the location',
   `venue` TEXT COMMENT 'Venue object. Message is a Venue, information about the Venue',
   `caption` TEXT COMMENT  'For message with caption, the actual UTF-8 text of the caption',
-  `new_chat_members` TEXT COMMENT 'Array of unique user identifiers, a new member(s) were added to the group, information about them (one of this member may be bot itself)',
-  `left_chat_member` bigint NULL DEFAULT NULL COMMENT 'Unique user identifier, a member was removed from the group, information about them (this member may be bot itself)',
+  `new_chat_members` TEXT COMMENT 'Array of unique user identifiers, new member(s) were added to the group, information about them (one of these members may be the bot itself)',
+  `left_chat_member` bigint NULL DEFAULT NULL COMMENT 'Unique user identifier, a member was removed from the group, information about them (this member may be the bot itself)',
   `new_chat_title` CHAR(255) DEFAULT NULL COMMENT 'A chat title was changed to this value',
   `new_chat_photo` TEXT COMMENT 'Array of PhotoSize objects. A chat photo was change to this value',
   `delete_chat_photo` tinyint(1) DEFAULT 0 COMMENT 'Informs that the chat photo was deleted',
   `group_chat_created` tinyint(1) DEFAULT 0 COMMENT 'Informs that the group has been created',
   `supergroup_chat_created` tinyint(1) DEFAULT 0 COMMENT 'Informs that the supergroup has been created',
   `channel_chat_created` tinyint(1) DEFAULT 0 COMMENT 'Informs that the channel chat has been created',
-  `migrate_to_chat_id` bigint NULL DEFAULT NULL COMMENT 'Migrate to chat identifier. The group has been migrated to a supergroup with the specified identifie',
+  `migrate_to_chat_id` bigint NULL DEFAULT NULL COMMENT 'Migrate to chat identifier. The group has been migrated to a supergroup with the specified identifier',
   `migrate_from_chat_id` bigint NULL DEFAULT NULL COMMENT 'Migrate from chat identifier. The supergroup has been migrated from a group with the specified identifier',
   `pinned_message` TEXT NULL COMMENT 'Message object. Specified message was pinned',
 
@@ -160,7 +160,7 @@ CREATE TABLE IF NOT EXISTS `edited_message` (
 ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_520_ci;
 
 CREATE TABLE IF NOT EXISTS `telegram_update` (
-  `id` bigint UNSIGNED COMMENT 'Update\'s unique identifier',
+  `id` bigint UNSIGNED COMMENT 'Update''s unique identifier',
   `chat_id` bigint NULL DEFAULT NULL COMMENT 'Unique chat identifier',
   `message_id` bigint UNSIGNED DEFAULT NULL COMMENT 'Unique message identifier',
   `inline_query_id` bigint UNSIGNED DEFAULT NULL COMMENT 'Unique inline query identifier',