Update geospatial stage description for GEOSEARCH command usage and examples.

Author: rohitpaulk

stage_descriptions/geospatial-08-rm9.md

@@ -1,26 +1,31 @@
-In this stage, you'll add support for searching locations near a coordinate within a given radius using the `GEOSEARCH` command.
+In this stage, you'll add support for searching locations within a given radius using the `GEOSEARCH` command.
 
 ### The GEOSEARCH command
 
-The `GEOSEARCH` command lets you search for locations near a given coordinate within a specified area.
+The `GEOSEARCH` command lets you search for locations within a given radius.
 
-It supports several search modes. In our implementation, we'll focus only on the `FROMLONLAT` mode with distance unit in meters. The `FROMLONLAT` mode searching by directly specifying longitude and latitude. 
+It supports several search modes. In our implementation, we'll focus only on the `FROMLONLAT` mode. The `FROMLONLAT` mode searches by directly specifying longitude and latitude.
 
-For example, to search for locations within 100000 meters of the point (longitude: 2, latitude: 48) stored in the `places` key, you can use:
+Example usage:
 
 ```bash
-> GEOSEARCH places FROMLONLAT 2 48 BYRADIUS 100000 m
+> GEOSEARCH places FROMLONLAT 2 48 BYRADIUS 100 m
 1) "Paris"
 ```
 
+The example command above searches for locations in the `places` key that are within 100 meters of the point (longitude: 2, latitude: 48).
+
+The response is a RESP array containing the names of the locations that match the search criteria, each encoded as a [RESP bulk string](https://redis.io/docs/latest/develop/reference/protocol-spec/#bulk-strings).
+
+Note that there are two options we passed to the command:
+
 - `FROMLONLAT <longitude> <latitude>` — This option specifies the center point for the search.
 - `BYRADIUS <radius> <unit>` — This option searches within a circular area of the given radius and unit (m, km, mi, etc.).
 
-Redis supports other values for search origin option and shape option, but here we'll only use `FROMLONLAT` and `BYRADIUS`.
-
-It returns a RESP Array of member names, where each member's name is a encoded as a bulk string.
+Redis supports other such options, but in this challenge we'll only use `FROMLONLAT` and `BYRADIUS`.
 
 ### Tests
+
 The tester will execute your program like this:
 
 ```bash
@@ -36,7 +41,7 @@ $ redis-cli
 > GEOADD places -0.0884948 51.506479 "London"
 ```
 
-The tester will then send multiple `GEOSEARCH` commands specifying a latitude and longitude pair with `BYRADIUS` option specifying the distance and unit. For example, it may send the following command.
+The tester will then send multiple `GEOSEARCH` commands:
 
 ```bash
 > GEOSEARCH places FROMLONLAT 2 48 BYRADIUS 100000 m
@@ -49,7 +54,7 @@ The tester will then send multiple `GEOSEARCH` commands specifying a latitude an
 # Expecting ["Munich"]
 ```
 
-The value is a RESP array, which is encoded as:
+The tester will validate that the response is a RESP array, for example
 
 ```
 *2\r\n
@@ -59,6 +64,8 @@ $6\r\n
 London\r\n
 ```
 
+Locations can be returned in any order.
+
 ### Notes
-- The tester will only test using the `meters` unit.
-- The locations returned can be in any order since we are not implementing `ASC` or `DESC` option.
+
+- The tester will always use the `FROMLONLAT` and `BYRADIUS` options when sending a `GEOSEARCH` command.