Update README.md

s/writte/written/

Author: gregbo

tdr-test/README.md

@@ -2,11 +2,11 @@
 
 This is an example Python script that runs TDR test for every interface in an up status.
 
-The output is thrown to screen, plus writte to a file in bootflash.
+The output is thrown to screen, plus written to a file in bootflash.
 
 # requirements
 -- IOS-XE running >/= 16.3.1 also enabled for GuestShell
 -- 3850 Switches (TDR typically only works on Cat switches).
 
 # running
--- Run onbox.
+-- Run onbox.