Fix small typo

Author: samtstern

firestore/app/src/main/java/com/google/example/firestore/SolutionGeoqueries.java

@@ -55,7 +55,7 @@ public static void queryHashes() {
         final double radiusInKm = 50;
 
         // Each item in 'bounds' represents a startAt/endAt pair. We have to issue
-        // a separate query for each pair. There can be up to 9 pais of bounds
+        // a separate query for each pair. There can be up to 9 pairs of bounds
         // depending on overlap, but in most cases there are 4.
         List<GeoQueryBounds> bounds = GeoFireUtils.getGeoHashQueryBounds(center, radiusInKm);
         final List<Task<QuerySnapshot>> tasks = new ArrayList<>();

firestore/app/src/main/java/com/google/example/firestore/kotlin/SolutionGeoqueries.kt

@@ -41,7 +41,7 @@ class SolutionGeoqueries {
         val radiusInKm = 50.0
 
         // Each item in 'bounds' represents a startAt/endAt pair. We have to issue
-        // a separate query for each pair. There can be up to 9 pais of bounds
+        // a separate query for each pair. There can be up to 9 pairs of bounds
         // depending on overlap, but in most cases there are 4.
         val bounds = GeoFireUtils.getGeoHashQueryBounds(center, radiusInKm)
         val tasks: MutableList<Task<QuerySnapshot>> = ArrayList()
@@ -78,4 +78,4 @@ class SolutionGeoqueries {
                 }
         // [END fs_geo_query_hashes]
     }
-}
+}