docs: Add examples to documentation

docs/modules/Logging.md

@@ -15,10 +15,23 @@ Parse log level from text representation to level number
 
 Parse log level from text representation to level number
 
+#### Example
+
+```bash
+# Parse lower case log level
+parse_log_level "info"
+# Parse upper case log level
+parse_log_level "ERROR"
+```
+
 #### Arguments
 
 * **$1** (string): Log level to parse
 
+#### Variables set
+
+* **LOG_LEVEL** (the): global log level to use in the script
+
 #### Output on stdout
 
 * numeric log level
@@ -27,6 +40,14 @@ Parse log level from text representation to level number
 
 Log output on a given level, checks if $LOG_LEVEL, if not set defaults to INFO
 
+#### Example
+
+```bash
+# Log a message on info level
+log "$LOG_INFO" "this is a info message"
+log "LOG_DEBUG" "i am only visible when \$LOG_LEVEL is debug"
+```
+
 #### Arguments
 
 * **$1** (number): Numeric log level