[Doc] Add async I/O op (#1754)

Co-authored-by: NJeff Rasley <jerasley@microsoft.com>

docs/_tutorials/advanced-install.md

@@ -64,6 +64,7 @@ Available `DS_BUILD` options include:
 * `DS_BUILD_TRANSFORMER_INFERENCE` builds the transformer-inference op
 * `DS_BUILD_STOCHASTIC_TRANSFORMER` builds the stochastic transformer op
 * `DS_BUILD_UTILS` builds various optimized utilities
+* `DS_BUILD_AIO` builds the asynchcronous I/O op
 
 To speed up the build-all process, you can parallelize the compilation process with: