mount.{cifs,smb3}: add page (#10416)

pages/linux/mount.cifs.md

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+# mount.cifs
+
+> Mount SMB (Server Message Block) or CIFS (Common Internet File System) shares.
+> Note: you can also do the same thing by passing the `-t cifs` option to `mount`.
+> More information: <https://manned.org/mount.cifs>.
+
+- Connect using the specified username or `$USER` by default (you will be prompted for a password):
+
+`mount.cifs -o user={{username}} //{{server}}/{{share_name}} {{mountpoint}}`
+
+- Connect as the guest user (without a password):
+
+`mount.cifs -o guest //{{server}}/{{share_name}} {{mountpoint}}`
+
+- Set ownership information for the mounted directory:
+
+`mount.cifs -o uid={{user_id|username}},gid={{group_id|groupname}} //{{server}}/{{share_name}} {{mountpoint}}`

pages/linux/mount.smb3.md

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+# mount.smb3
+
+> This command is an alias of `mount.cifs`.
+> Note: for SMB versions before 3 you have to use `mount.cifs` instead.
+
+- View documentation for the original command:
+
+`tldr mount.cifs`