chore: add exit code section (#898)

* chore: add exit code section

* chore: apply rabbit review

Author: Dsaquel

website/reference/cli/run.md

@@ -199,4 +199,10 @@ This is equivalent to providing both the -B/--before and -A/--after flags with t
 [default: 0]
 
 ### `-h, --help`
-Print help (see a summary with '-h')
+Print help (see a summary with '-h')
+
+## Exit codes
+
+The program exits with status code:
+- **0**: at least one line matches
+- **1**: no matches found

website/reference/cli/scan.md

@@ -211,4 +211,10 @@ Turn off rule
 This flag turns off the specified RULE_ID. You can disable multiple rules by using the flag multiple times. If no RULE_ID is provided, all rules will be turned off. Note, this flag must use `=` to specify its value.
 
 ### `-h, --help`
-  Print help (see a summary with '-h')
+  Print help (see a summary with '-h')
+
+## Exit codes
+
+The program exits with status code:
+- **1**: if at least one rule matches
+- **0**: if no rules match