gdb_proc_service.h comment and whitespace synchronization

This commit updates comments and whitespace in GDB's and gdbserver's
gdb_proc_service.h.

gdb/ChangeLog:

	* gdb_proc_service.h: Whitespace change.

gdb/gdbserver/ChangeLog:

	* gdb_proc_service.h: Synchronize comments and whitespace with
	GDB's version of this file.