[openstreetmap/openstreetmap-website] Fix wget command for Windows installation guide (PR #5803)

[Ngoc Linh Le]

### Description
In Window Shell, I directed to `cd openstreetmap-website` > `ls` but cannot see data file for District of Columbia although the download StatusCode : 200 and StatusDescription : OK.

Added a note in DOCKER.md for Windows users regarding potential issues when downloading OSM extracts using wget. Some Windows configurations do not properly save the file unless -OutFile is explicitly specified.

### How has this been tested?
Tested on Windows 11 PowerShell using wget with and without -OutFile.
Verified that using -OutFile ensures the file is properly saved and can be found in the directory.
You can view, comment on, or merge this pull request online at:

  https://github.com/openstreetmap/openstreetmap-website/pull/5803

-- Commit Summary --

  * Fix wget command for Windows installation guide

-- File Changes --

    M DOCKER.md (4)

-- Patch Links --

https://github.com/openstreetmap/openstreetmap-website/pull/5803.patch
https://github.com/openstreetmap/openstreetmap-website/pull/5803.diff

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