Remove obsolete BUGS section from zgrep(1) man page, add test

I forgot to check/update the man page with D54217. While here add
a test for multiple -e flags.

Reviewed by:	markj
Approved by:	markj
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D54632

usr.bin/grep/tests/grep_freebsd_test.sh

@@ -126,6 +126,16 @@ qflag_body()
 	atf_check zgrep -q '1 2' in
 }
 
+atf_test_case eflags
+eflags_body()
+{
+	# Test use with more than one -e expression
+	printf "aaa bbb ccc\n111 222 333\ndon't match this line" > in
+
+	atf_check -o 'inline:aaa bbb ccc\n111 222 333\n' \
+	    /tmp/zgrep.sh -eaaa -e333 in
+}
+
 atf_init_test_cases()
 {
 	atf_add_test_case grep_r_implied
@@ -134,4 +144,5 @@ atf_init_test_cases()
 	atf_add_test_case zflag
 	atf_add_test_case color_dupe
 	atf_add_test_case qflag
+	atf_add_test_case eflags
 }

usr.bin/grep/zgrep.1

@@ -92,21 +92,3 @@ This version of the
 .Nm
 utility was written by
 .An Thomas Klausner Aq Mt wiz@NetBSD.org .
-.Sh BUGS
-.Xr zgrep 1
-does not handle flags that take arguments if there is no whitespace
-between the flag and the argument, for example:
-.Pp
-.Dl "zgrep -enfs /etc/rpc"
-.Pp
-When more than one
-.Fl e
-flag is used matching
-should occur for any of the patterns (similar to multiple patterns
-supplied in a file with the
-.Fl f
-flag).
-.Xr zgrep 1
-only matches the last
-.Fl e
-pattern.