USBmap clean up

At the moment, a few sections are confusing for the end user or needs better clarification:

* [ ] Expand on `Fixing USB Power`
* Mention power tunning and using an Injector Kext for older SMBIOS
* Mention USBX devices cause sleep issues on AMD: https://github.com/dortania/bugtracker/issues/15
* [ ] Expand on `Instant Wake Patch` section
* Properly explain what those renames and SSDTs do
* [ ] USBX requires EC only on 10.14 and older
* USBX devices cause sleep issues on AMD
* [ ] USBInjectAll can help resolve missing ACPI ports
* Would like to outright remove USBInjectAll in the future with USBToolBox
* [ ] Mention mapping issues with USBMergeNub on Catalina with AMD
* See here: https://github.com/dortania/bugtracker/issues/15
* [ ] Mention mapping via IOService pathing(avoids controller renames for AMD)
* ie:
```
IOPathMatch | String | IOService:/AppleACPIPlatformExpert/PCI0@0/AppleACPIPCI/GP13@8,1/IOPP/XHC@0,3/XHC@60000000
```