megadl: add page (#6600)

pages/linux/megadl.md

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+# megadl
+
+> This command is an alias of `megatools-dl`.
+> More information: <https://megatools.megous.com/man/megatools-dl.html>.
+
+- View documentation for the original command:
+
+`tldr megatools-dl`

pages/linux/megatools-dl.md

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+# megatools-dl
+
+> Download files from `mega.nz`.
+> Part of the `megatools` suite.
+> More information: <https://megatools.megous.com/man/megatools-dl.html>.
+
+- Download files from a `mega.nz` link into the current directory:
+
+`megatools-dl {{https://mega.nz/...}}`
+
+- Download files from a `mega.nz` link into a specific directory:
+
+`megatools-dl --path {{path/to/directory}} {{https://mega.nz/...}}`
+
+- Interactively choose which files to download:
+
+`megatools-dl --choose-files {{https://mega.nz/...}}`
+
+- Limit the download speed in KiB/s:
+
+`megatools-dl --limit-speed {{speed}} {{https://mega.nz/...}}`