Update s2.md

Author: alexey-milovidov

docs/en/sql-reference/functions/geo/s2.md

@@ -9,7 +9,7 @@ description: 'Documentation for functions for working with S2 indexes'
 
 ## S2Index {#s2index}
 
-[S2](https://s2geometry.io/) is a geographical indexing system where all geographical data is represented on a three-dimensional sphere (similar to a globe).
+[S2](https://s2geometry.io/) is a geographical indexing system where all geographical data is represented on a sphere (similar to a globe).
 
 In the S2 library points are represented as the S2 Index - a specific number which encodes internally a point on the surface of a unit sphere, unlike traditional (latitude, longitude) pairs. To get the S2 point index for a given point specified in the format (latitude, longitude) use the [geoToS2](#geotos2) function. Also, you can use the [s2ToGeo](#s2togeo) function for getting geographical coordinates corresponding to the specified S2 point index.