Correct a trivial typographical error in the guide

I corrected "you implementation" to "your implementation".

Author: mANIApHOBIC

process/guide.md

@@ -109,7 +109,7 @@ IMPLS = ... quux ...
 quux_STEP_TO_PROG = mylang/$($(1)).qx
 ```
 
-* Add a "run" script to you implementation directory that listens to
+* Add a "run" script to your implementation directory that listens to
   the "STEP" environment variable for the implementation step to run
   and defaults to "stepA_mal". Make sure the run script has the
   executable file permission set (or else the test runner might fail with a