doc: caplog: add caplog.messages (#5963)

doc: caplog: add caplog.messages

Author: nicoddemus

src/_pytest/logging.py

@@ -356,6 +356,7 @@ def caplog(request):
 
     Captured logs are available through the following properties/methods::
 
+    * caplog.messages        -> list of format-interpolated log messages
     * caplog.text            -> string containing formatted log output
     * caplog.records         -> list of logging.LogRecord instances
     * caplog.record_tuples   -> list of (logger_name, level, message) tuples