docs: `NC_MAX_ATTACHMENTS_ALLOWED` (#7894)

see https://github.com/nocodb/nocodb/pull/4820

packages/noco-docs/docs/020.getting-started/050.self-hosted/020.environment-variables.md

@@ -59,8 +59,9 @@ For production use-cases, it is **recommended** to configure
 | NC_S3_REGION                       | For S3 storage plugin - AWS S3 region                                                                                                                                                                                                       |                                                                                                |
 | NC_S3_ACCESS_KEY                   | For S3 storage plugin - AWS access key credential for accessing resource                                                                                                                                                                    |                                                                                                |
 | NC_S3_ACCESS_SECRET                | For S3 storage plugin - AWS access secret credential for accessing resource                                                                                                                                                                 |                                                                                                |
-| NC_ADMIN_EMAIL                     | For updating/creating super admin with provided email and password                                                                                                                                                                          |                                                                                                |
 | NC_ATTACHMENT_FIELD_SIZE           | For setting the attachment field size(in Bytes)                                                                                                                                                                                             | Defaults to 20MB                                                                               |
+| NC_MAX_ATTACHMENTS_ALLOWED         | Maximum Number of attachments per cell                                                                                                                                                                                                      |                                                                                                |
+| NC_ADMIN_EMAIL                     | For updating/creating super admin with provided email and password                                                                                                                                                                          |                                                                                                |
 | NC_ADMIN_PASSWORD                  | For updating/creating super admin with provided email and password. Your password should have at least 8 letters with one uppercase, one number and one special letter(Allowed special chars $&+,:;=?@#\|'.^*()%!_-" )                      |                                                                                                |
 | NODE_OPTIONS                       | For passing Node.js [options](https://nodejs.org/api/cli.html#node_optionsoptions) to instance                                                                                                                                              |                                                                                                |
 | NC_MINIMAL_DBS                     | Create a new SQLite file for each project. All the db files are stored in `nc_minimal_dbs` folder in current working directory. (This option restricts project creation on external sources)                                                |                                                                                                |