[CI:DOCS] Update podmanimage comment.

Drop a reference as to why the `rpm --setcaps...` line is needed, along
with a `TODO` reminder to check if it's still needed.

Signed-off-by: Chris Evich <cevich@redhat.com>

contrib/podmanimage/stable/Containerfile

@@ -11,6 +11,9 @@ FROM registry.fedoraproject.org/fedora:latest
 # Don't include container-selinux and remove
 # directories used by dnf that are just taking
 # up space.
+# TODO: rpm --setcaps... needed due to Fedora (base) image builds
+#       being (maybe still?) affected by
+#       https://bugzilla.redhat.com/show_bug.cgi?id=1995337#c3
 RUN dnf -y update && \
     rpm --setcaps shadow-utils 2>/dev/null && \
     dnf -y install podman fuse-overlayfs \

contrib/podmanimage/testing/Containerfile

@@ -11,6 +11,9 @@ FROM registry.fedoraproject.org/fedora:latest
 # Don't include container-selinux and remove
 # directories used by dnf that are just taking
 # up space.
+# TODO: rpm --setcaps... needed due to Fedora (base) image builds
+#       being (maybe still?) affected by
+#       https://bugzilla.redhat.com/show_bug.cgi?id=1995337#c3
 RUN dnf -y update && \
     rpm --setcaps shadow-utils 2>/dev/null && \
     dnf -y install podman fuse-overlayfs \

contrib/podmanimage/upstream/Containerfile

@@ -14,6 +14,9 @@ FROM registry.fedoraproject.org/fedora:latest
 # directories used by dnf that are just taking
 # up space.  The latest podman + deps. come from
 # https://copr.fedorainfracloud.org/coprs/rhcontainerbot/podman-next/
+# TODO: rpm --setcaps... needed due to Fedora (base) image builds
+#       being (maybe still?) affected by
+#       https://bugzilla.redhat.com/show_bug.cgi?id=1995337#c3
 RUN dnf -y update && \
     rpm --setcaps shadow-utils 2>/dev/null && \
     dnf -y install 'dnf-command(copr)' --enablerepo=updates-testing && \