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Add inline comments section (#14507) 

* Add inline comments section

Signed-off-by: Ulysses Souza <ulyssessouza@gmail.com>

* Update compose/compose-file/compose-file-v3.md

Co-authored-by: Usha Mandya <47779042+usha-mandya@users.noreply.github.com>
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@ -1107,6 +1107,16 @@ also ignored.
RACK_ENV=development
```
Compose also recognizes inline comments, like in:
```
MY_VAR = value # this is a comment
```
To avoid interpreting "#" as an inline comment, use the quotation marks:
```
MY_VAR = "All the # inside are taken as part of the value"
```
> **Note**
>
> If your service specifies a [build](#build) option, variables defined in