Removed outdated information about Windows support (#7971)

Newer versions of Telegraf for Windows do not appear to support using WMI query patterns as values for the "pattern" option. Regular expressions appear to be the only patterns now supported.

plugins/inputs/procstat/README.md

@@ -64,15 +64,6 @@ Processes can be selected for monitoring using one of several methods:
 Preliminary support for Windows has been added, however you may prefer using
 the `win_perf_counters` input plugin as a more mature alternative.
 
-When using the `pid_finder = "native"` in Windows, the pattern lookup method is
-implemented as a WMI query.  The pattern allows fuzzy matching using only
-[WMI query patterns](https://msdn.microsoft.com/en-us/library/aa392263(v=vs.85).aspx):
-```toml
-[[inputs.procstat]]
-  pattern = "%influx%"
-  pid_finder = "native"
-```
-
 ### Metrics:
 
 - procstat