DOCSP-33325: Update configuration instructions (#41)

Author: norareidy

source/quick-start/download-and-install.txt

@@ -37,13 +37,19 @@ Download and Install
 
    .. step:: Install the Rust Driver
 
-      Add the following crates to your project by including them in the 
+      Add the following crates to your project by including them in the
       dependencies list located in your project's ``Cargo.toml`` file:
 
       - ``mongodb``, the {+driver-short+} crate
-      - ``bson``, the MongoDB data representation crate
-      - ``serde_json``, A JSON data representation crate
-      
+      - ``serde_json``, a JSON data representation crate
+      - ``futures``, an asynchronous runtime crate that provides core abstractions
+
+      .. tip::
+   
+         The ``mongodb`` crate resolves the ``bson`` crate, which is the primary
+         MongoDB data representation crate. You do not need to add the ``bson``
+         crate to your dependencies list.
+
       The following code shows an example dependencies list that
       includes the preceding crates:
 
@@ -55,27 +61,60 @@ Download and Install
             .. code-block:: bash
 
                [dependencies]
-               bson = "2.7.0"
                serde_json = "1.0.107"
+               futures = "0.3.28"
+               tokio = {version = "1.32.0", features = ["full"]}
 
                [dependencies.mongodb]
                version = "{+version+}"
-               default-features = false
-               features = ["async-std-runtime"]
+               features = ["tokio-runtime"]
 
          .. tab:: Synchronous API
             :tabid: synchronous-api
 
             .. code-block:: bash
 
                [dependencies]
-               bson = "2.7.0"
                serde_json = "1.0.107"
 
                [dependencies.mongodb]
                version = "{+version+}"
                features = ["tokio-sync"]
 
+      .. tip::
+
+         The ``tokio`` asynchronous runtime is the driver's default runtime crate
+         and does not require a feature flag. The preceding code example includes
+         the ``"tokio-runtime"`` feature flag to specify the ``tokio`` runtime, but
+         this flag is optional.
+      
+      If you want to use a different synchronous or asynchronous runtime crate,
+      replace the feature flag with your runtime crate's corresponding flag.
+      The driver supports the following alternative feature flags, which use the
+      `async-std <https://crates.io/crates/async-std>`__ crate runtime:
+
+      - The ``"async-std-runtime"`` feature flag
+      - The ``"sync"`` feature flag
+
+      For more information about these feature flags, see the `API documentation
+      <{+api+}/#all-feature-flags>`__.
+
+      If you want to use both the asynchronous and synchronous runtimes, specify
+      the ``tokio`` runtime dependency and include the ``"tokio-sync"`` flag in
+      ``dependencies.mongodb``. The following code shows an example dependencies
+      list that supports sync and async code:
+
+      .. code-block:: bash
+         
+         [dependencies]
+         serde_json = "1.0.107"
+         futures = "0.3.28"
+         tokio = {version = "1.32.0", features = ["full"]}
+
+         [dependencies.mongodb]
+         version = "2.6.1"
+         features = ["tokio-sync"]
+
 After you complete these steps, you should have Rust and Cargo installed 
 and a new Rust project with the necessary driver dependencies.