Remove version fields from Docker Compose override file examples (#5545)

I was supposed to do this in #5524 when I was removing them everywhere
else, but I didn't think to search the documentation. Compose override
files must have the same format as the base file, otherwise Docker
Compose rejects them.

Fixes #5544.

site/content/en/docs/administration/advanced/ldap.md

@@ -27,8 +27,6 @@ In your override config you need to passthrough your settings and tell CVAT to
 use them by setting the `DJANGO_SETTINGS_MODULE` variable.
 
 ```yml
-version: '3.3'
-
 services:
   cvat:
     environment:

site/content/en/docs/administration/basics/installation.md

@@ -448,8 +448,6 @@ To do that you can mount it to CVAT docker container. Example of
 docker-compose.override.yml for this purpose:
 
 ```yml
-version: '3.3'
-
 services:
   cvat_server:
     volumes:

site/content/en/docs/administration/basics/social-accounts-configuration.md

@@ -32,7 +32,6 @@ To enable authentication, do the following:
    1. Create `docker-compose.override.yml` with the following code:
 
    ```yaml
-   version: '3.3'
    services:
      cvat_server:
        environment:
@@ -62,7 +61,6 @@ There are 2 basic steps to enable Github account authentication.
    1. Create `docker-compose.override.yml` with the following code:
 
    ```yaml
-   version: '3.3'
    services:
      cvat_server:
        environment:

site/content/en/docs/faq.md

@@ -87,8 +87,6 @@ Follow the Docker manual and configure the directory that you want to use as a s
 After that, it should be possible to use this directory as a CVAT share:
 
 ```yaml
-version: '3.3'
-
 services:
   cvat:
     volumes: