Docs: update pmtiles.rst with examples (#9977)

Added examples on translation from shape file and postgres/postgis

doc/source/drivers/vector/pmtiles.rst

@@ -337,6 +337,18 @@ Extracting all content in a local directory:
 
     python swig/python/gdal-utils/osgeo_utils/samples/gdal_cp.py -r "/vsipmtiles//vsicurl/https://protomaps.github.io/PMTiles/protomaps(vector)ODbL_firenze.pmtiles" out_pmtiles
 
+Examples
+--------
+-  Simple translation of a single shapefile into PMTiles. Dataset creation options (dsco) MINZOOM and MAXZOOM specifies tile zoom levels.
+   ::
+
+      ogr2ogr -dsco MINZOOM=10 -dsco MAXZOOM=20 -f "PMTiles" filename.pmtiles my_shapes.shp
+
+-  Merge all PostgreSQL/PostGIS tables in a schema into a single PMTiles file. PostgreSQL table names are used as layer names. Dataset creation options (dsco) MINZOOM and MAXZOOM specifies tile zoom levels.
+   ::
+
+      ogr2ogr -dsco MINZOOM=0 -dsco MAXZOOM=22 -f "PMTiles" filename.pmtiles "PG:host=my_host port=my_port dbname=my_database user=my_user password=my_password schemas=my_schema"
+
 
 See Also
 --------