docs(readme): 📝 Small edits

Author: chrisguest75

37_guids/README.md

@@ -51,6 +51,8 @@ echo "$(( ( RANDOM % 10 )  + 1 ))"
 
 ```sh
 LC_CTYPE=C tr -dc A-Za-z0-9 < /dev/random | head -c 60 | xargs
+# or
+head /dev/urandom | tr -dc a-f0-9 | head -c 40
 ```
 
 ## cksum
@@ -62,6 +64,12 @@ This technique can be used for consistent hashing
 echo $(echo "hashingstring" | cksum | cut -f 1 -d \ )
 ```
 
+## 
+
+```sh
+head /dev/urandom | tr -dc a-f0-9 | head -c 40
+```
+
 ## Resources
 
 * /dev/random example [here](https://gist.github.com/5c0tt/b9f452a9076daca4fa35)  

README.md

@@ -172,7 +172,7 @@ Steps [README.md](./02_job_functions/README.md)
 ## 03 - Pipe filters
 
 Demonstrates how read from stdin stream and process it.  
-Steps [README.md](./03_pipe_filter_function/README.md)  
+Steps [README.md](./03_pipe_filter_functions/README.md)  
 
 ## 04 - Trap handlers