Add descriptions and remove leftovers from old change note.

Author: taus-semmle

change-notes/1.20/analysis-python.md

@@ -9,14 +9,11 @@
 
  | **Query**                   | **Tags**  | **Purpose**                                                        |
 |-----------------------------|-----------|--------------------------------------------------------------------|
-| Default version of SSL/TLS may be insecure (`py/insecure-default-protocol`) | security, external/cwe/cwe-327 | Results are shown on LGTM by default. |
-| Use of insecure SSL/TLS version (`py/insecure-protocol`) | security, external/cwe/cwe-327 | Results are shown on LGTM by default. |
+| Default version of SSL/TLS may be insecure (`py/insecure-default-protocol`) | security, external/cwe/cwe-327 | Finds instances where an insecure default protocol may be used. Results are shown on LGTM by default. |
+| Use of insecure SSL/TLS version (`py/insecure-protocol`) | security, external/cwe/cwe-327 | Finds instances where a known insecure protocol has been specified. Results are shown on LGTM by default. |
 
  ## Changes to existing queries
 
- All taint-tracking queries now support visualization of paths in QL for Eclipse.
-Most security alerts are now visible on LGTM by default.
-
  | **Query**                  | **Expected impact**    | **Change**                                                       |
 |----------------------------|------------------------|------------------------------------------------------------------|