Update documentation

doc/cli_commands/actev_validate_system.md

@@ -2,9 +2,22 @@
 
 ## Description
 
-Checks the structure of the  directory after ActEV-system-setup is run. Checks for expected API contents, etc.
+Checks the structure of the  directory after ActEV-system-setup is run. Checks for global directory structure, expected API contents, and system outputs directory and integrity.
+The `--strict` flag causes the command to throw an exception on an error. Otherwise only WARNING logs are displayed.
 
-The command contains the following subcommands:
+In order to succed:
+ * The repository contains the required sub-directories,
+ * The signatures of the .src.** functions have to remain unchanged,
+ * The container_outputs directory contains at least one system output,
+ * Each reported system output is different from the baseline's,
+ * Names of the directories inside `container_outputs/` start with a dataset name.
+
+
+## Parameters
+
+| Name      | Id         | Required | Definition                 |
+|-----------|------------|---------|----------------------------|
+| strict         | --strict | False    | Whether to throw an exception on an error.    |
 
 ## Usage
 
@@ -12,3 +25,8 @@ The command contains the following subcommands:
 actev validate-system
 ```
 
+Example:
+
+```
+actev validate-system --strict
+```
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