[FS#35] mynet-n750 factory images don't find root partition - Comment added

[LEDE Bugs]

The following task has a new comment added:

FS#35 - mynet-n750 factory images don't find root partition
User who did this - Steven Haigh (CRCinAU)

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As a comparison, this is the mtd layout for a working r813 installed via sysupgrade:

[    0.641377] 6 cmdlinepart partitions found on MTD device spi0.0
[    0.647398] Creating 6 MTD partitions on "spi0.0":
[    0.652268] 0x000000000000-0x000000040000 : "u-boot"
[    0.659339] 0x000000040000-0x000000050000 : "u-boot-env"
[    0.666300] 0x000000050000-0x000000060000 : "devdata"
[    0.672994] 0x000000060000-0x000000070000 : "devconf"
[    0.679627] 0x000000070000-0x000000ff0000 : "firmware"
[    0.715565] 2 seama-fw partitions found on MTD device firmware
[    0.721501] 0x000000070040-0x0000001d0000 : "kernel"
[    0.727929] 0x0000001d0000-0x000000ff0000 : "rootfs"
[    0.734550] mtd: device 6 (rootfs) set to be root filesystem
[    0.740345] 1 squashfs-split partitions found on MTD device rootfs
[    0.746668] 0x0000003b0000-0x000000ff0000 : "rootfs_data"
[    0.753793] 0x000000ff0000-0x000001000000 : "radiocfg"
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More information can be found at the following URL:
https://bugs.lede-project.org/index.php?do=details&task_id=35#comment75