replace outdated documentation about tested platforms

Author: rcsanchez97

docs/content/mongocxx-v3/installation/_index.md

@@ -14,17 +14,8 @@ title = "Installing the mongocxx driver"
 - [CMake](https://cmake.org) 3.2 or later
 - [boost](https://www.boost.org) headers (optional)
 
-We currently test the driver on the following platforms:
-
-- Linux with clang 3.8 and 6.0, GCC 5.4 and 7.5
-- macOS with Apple clang 11.0 using Boost 1.70.0
-- Windows with Visual Studio 2015 using Boost 1.60.0 and Visual Studio 2017
-
-Versions older than the ones listed may not work and are not
-supported; use them at your own risk.
-
-Versions newer than the ones listed above should work; if you
-have problems, please file a bug report via
+If you encounter build failures or other problems with a platform configuration
+that meets the above prerequisites, please file a bug report via
 [JIRA](https://jira.mongodb.org/browse/CXX/).
 
 ## Installation