syscalls.2: srcfix: add FIXMEs

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>

man2/syscalls.2

@@ -304,6 +304,8 @@ T}
 .\" Implements System V IPC calls
 \fBkcmp\fP(2)	3.5
 \fBkern_features\fP(2)	3.7	Sparc64
+.\" FIXME: document kern_features():
+.\" commit 517ffce4e1a03aea979fe3a18a3dd1761a24fafb
 \fBkexec_load\fP(2)	2.6.13
 .\" The entry in the syscall table was reserved starting in 2.6.7
 .\" Was named sys_kexec_load() from 2.6.7 to 2.6.16
@@ -584,6 +586,8 @@ T}
 \fButimensat\fP(2)	2.6.22
 \fButimes\fP(2)	2.2
 \fButrap_install\fP(2)	2.2	Sparc
+.\" FIXME: document utrap_install()
+.\" There's a man page for Solaris 5.11
 \fBvfork\fP(2)	2.2
 \fBvhangup\fP(2)	1.0
 \fBvm86old\fP(2)	1.0	T{