Update cheatsheets

tldr/ideviceimagemounter

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# ideviceimagemounter
+
+> Mount disk images on an iOS device.
+> More information: <https://manned.org/ideviceimagemounter>.
+
+- Mount a disk image on the connected device:
+
+`ideviceimagemounter {{path/to/image_file}} {{path/to/signature_file}}`
+
+- List currently mounted disk images:
+
+`ideviceimagemounter --list`