Fix “find” page to work around {} in tokens

osx/find.md

@@ -1,14 +1,15 @@
 # find
 
-> Find files under the current directory tree, recursively
+> Find files under the given directory tree, recursively
 
 - find files by extension
 
 `find {{root_path}} -name {{'*.py'}}`
 
 - run a command for each file
+- use {} within the command to access the filename
 
-`find {{root_path}} -name {{'*.py'}} -exec {{wc -l {}}} \;`
+`find {{root_path}} -name {{'*.py'}} -exec {{command}} \;`
 
 - find files modified since a certain time