Remove option --exclude-invalid-polygon from docs

It is not supported (any more).

Author: joto

docs/osm2pgsql.1

@@ -195,16 +195,6 @@ By default natural=coastline tagged data will be discarded based on the
 assumption that Shapefiles generated by OSMCoastline (https://osmdata.openstreetmap.de/)
 will be used.
 .TP
-\fB\  \fR\-\-exclude\-invalid\-polygon
-OpenStreetMap data is defined in terms of nodes, ways and relations and not in
-terms of actual geometric features. Osm2pgsql therefore tries to build PostGIS
-geometries out of this data representation. However not all ways and relations
-correspond to valid PostGIS geometries (e.g. self intersecting polygons). By
-default osm2pgsql tries to fix these geometries using buffer(0) around the
-invalid polygons. With this option, invalid polygons are instead simply dropped
-from the database. Even without this option, all polygons in the database should
-be valid.
-.TP
 \fB\  \fR\-\-number\-processes num
 Specifies the number of parallel processes used for certain operations. If disks are
 fast enough e.g. if you have an SSD, then this can greatly increase speed of