Update geospatial stage description for the GEOADD command and its usage.

Author: rohitpaulk

stage_descriptions/geospatial-01-zt4.md

@@ -1,32 +1,43 @@
 In this stage, you'll add support for responding to the `GEOADD` command.
 
 ### The `GEOADD` command
-The `GEOADD` command adds a location (with longitude, latitude, and name) to a key. It stores the location as a [sorted set](https://redis.io/docs/latest/develop/data-types/sorted-sets/) under the specified key. If the key doesn’t exist, a new sorted set is created under the specified name and the location is inserted to it. If the key exists, the location is inserted in the sorted set.
+
+The [`GEOADD` command](https://redis.io/docs/latest/commands/geoadd/) adds a location (with longitude, latitude, and name) to a key. It stores the location as a [sorted set](https://redis.io/docs/latest/develop/data-types/sorted-sets/) under the specified key.
 
 Example usage:
 
 ```bash
 > GEOADD places -0.0884948 51.506479 "London"
 (integer) 1
 ```
-The argument order of `GEOADD` argument – key, longitude, latitude, member (longitude first, then latitude).
+
+The arguments `GEOADD` accepts are:
+
+1. `key`: The key to store the location in.
+2. `longitude`: The longitude of the location.
+3. `latitude`: The latitude of the location.
+4. `member`: The name of the location.
+
+If the key doesn’t exist, a new sorted set is created under the specified name and the location is inserted to it. If the key exists, the location is inserted in the sorted set.
 
 It returns the count of elements added, encoded as a RESP Integer.
 
 ### Tests
+
 The tester will execute your program like this:
 
 ```bash
 $ ./your_program.sh
 ```
 
-It will then send a `GEOADD` command specifying a key, latitude, longitude, and location name.
+It will then send a `GEOADD` command:
 
 ```bash
 $ redis-cli GEOADD places 11.5030378 48.164271 Munich
 ```
 
-The tester will expect the response to be `:1\r\n`, which is 1(number of locations added) encoded as a RESP integer.
+The tester will expect the response to be `:1\r\n`, which is 1 (number of locations added) encoded as a RESP integer.
 
 ### Notes
-- In this stage, you will only implement responding the the `GEOADD` command. You don't need to store the locations yet. We'll get to storing the locations in the later stages.
+
+- In this stage, you will only implement responding the the `GEOADD` command. You don't need to store the locations yet. We'll get to storing the locations in the later stages.