fix(grouping): Remove stray characters in code samples for Stack Trace Rules (#4139)

Author: untitaker

src/docs/product/data-management-settings/event-grouping/stack-trace-rules.mdx

@@ -61,13 +61,13 @@ This matcher is case insensitive with Unix glob behavior on a path in a stack tr
 
 ```discover {tabTitle:Enhancement Rules}
 # match on all files under `project` with a `.c` extension
-stack.abs_path:**/project/**.c` +app
+stack.abs_path:**/project/**.c +app
 
 # matches on vendor/foo without sub folders
-stack.abs_path:**/vendor/foo/*.c` -app
+stack.abs_path:**/vendor/foo/*.c -app
 
 # matches on `foo.c` as well as `foo/bar.c`.
-stack.abs_path:**/*.gen.c` -group
+stack.abs_path:**/*.gen.c -group
 ```
 
 ### `stack.module`