Update ini-config.adoc

The example startup G-code was actually invalid. 
Based on #2535

Author: andypugh

docs/src/config/ini-config.adoc

@@ -491,7 +491,7 @@ if __name__ == "__main__":
 * `ORIENT_OFFSET = 0` - (((ORIENT OFFSET)))
   A float value added to the R word parameter of an <<mcode:m19,M19 Orient Spindle>> operation.
   Used to define an arbitrary zero position regardless of encoder mount orientation.
-* `RS274NGC_STARTUP_CODE = G17 G20 G40 G49 G64 P0.001 G80 G90 G92 G94 G97 G98` - (((RS274NGC STARTUP CODE)))
+* `RS274NGC_STARTUP_CODE = G17 G20 G40 G49 G64 P0.001 G80 G90 G92.1 G94 G97 G98` - (((RS274NGC STARTUP CODE)))
   A string of NC codes that the interpreter is initialized with.
   This is not a substitute for specifying modal G-codes at the top of each NGC file,
   because the modal codes of machines differ, and may be changed by G-code interpreted earlier in the session.