[Ada] Reserving switch d_K for known problem isssues detection

[Pierre-Marie de Rodat]

This patch documents that switch -gnatd_K is reserved to enable
machinery that detects known problem issues of previous releases.

Tested on x86_64-pc-linux-gnu, committed on trunk

2019-12-18  Javier Miranda  <miranda@adacore.com>

gcc/ada/

	* debug.adb: Document -gnatd_K as a reserved switch for the
	detection of known problem issues of previous releases.
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