MDEV-19537: Document mysqlimport option ignore-foreign-keys

man/mysqlimport.1

 '\" t
 .\"
-.TH "\FBMYSQLIMPORT\FR" "1" "14/12/2015" "MariaDB 10\&.1" "MariaDB Database System"
+.TH "\FBMYSQLIMPORT\FR" "1" "21 May 2019" "MariaDB 10\&.1" "MariaDB Database System"
 .\" -----------------------------------------------------------------
 .\" * set default formatting
 .\" -----------------------------------------------------------------
@@ -346,6 +346,22 @@ option\&.
 .sp -1
 .IP \(bu 2.3
 .\}
+.\" mysqlimport: ignore-foreign-keys option
+.\" ignore-foreign-keys option: mysqlimport
+\fB\-\-ignore\-foreign\-keys\fR,
+\fB\-k\fR
+.sp
+Disable foreign key checks while importing the data\&.
+.RE
+.sp
+.RS 4
+.ie n \{\
+\h'-04'\(bu\h'+03'\c
+.\}
+.el \{\
+.sp -1
+.IP \(bu 2.3
+.\}
 .\" mysqlimport: ignore-lines option
 .\" ignore-lines option: mysqlimport
 \fB\-\-ignore\-lines=\fR\fB\fIN\fR\fR