[swift-snapshot-tool] Two small improvements to the README.md

utils/swift_snapshot_tool/README.md

@@ -23,6 +23,10 @@ value is at. This allows for one to get a sense of the range of time in between
 two bisect numbers since one can look at the range in between them and how time
 varies.
 
+One can specify a branch of snapshots to list. By default uses
+--development. Also supports the options --release_5_0, --release_6_0,
+--release_6_2.
+
 ## Run
 
 ```
@@ -56,7 +60,8 @@ Options:
   an error was fixed.
 
 - branch: This controls the specific branch of snapshots that are downloaded. By
-  default uses development. Also supports the options 5.0 and 6.0.
+  default uses --development. Also supports the options --release_5_0,
+  --release_6_0, --release_6_2.
 
 ## Bisect
 
@@ -94,4 +99,17 @@ Options:
   an error was fixed.
 
 - branch: This controls the specific branch of snapshots that are downloaded. By
-  default uses development. Also supports the options 5.0 and 6.0.
+  default uses --development. Also supports the options --release_5_0,
+  --release_6_0, --release_6_2.
+
+# FAQ and Helpful Tips
+
+## Bisecting against examples using Swift Testing
+
+Swift Testing is not stored in the normal place in a toolchain. To test against
+such an example that uses swift testing pass into ones script the following -I
+command:
+
+```
+xcrun ${SWIFTC}  "${@:1}" -o binary -parse-as-library -I ${SWIFT_LIBRARY_PATH}/testing
+```