sed: Add example to delete lines (#2596)

pages/common/sed.md

@@ -18,6 +18,10 @@
 
 `sed '/{{line_pattern}}/s/{{find}}/{{replace}}/' {{filename}}`
 
+- Delete lines matching the line pattern:
+
+`sed '/{{line_pattern}}/d' {{filename}}`
+
 - Print only text between n-th line till the next empty line:
 
 `sed -n '{{line_number}},/^$/p' {{filename}}`