Fix vault.inc documentation (#550)

* Fix vault.inc documentation

* Add missing *

* Fix typos

plugins/include/vault.inc

@@ -16,16 +16,45 @@
 #endif
 #define _vault_included
 
-/* Reads a data from given key.
+ /**
-* If len is set to zero then get_vaultdata
+ * Reads data from a given key.
-* returns value as an number. */
+ *
+ *
+ * @param key           Key to get the value from
+ * @param data          Buffer to copy the value to
+ * @param len           Buffer size. If len is set to 0 then the function will 
+ * 			        	 return the value as a number
+ *
+ * @return              If len is not 0 the function will return the number of characters written.
+					 If len is 0 the function will return the numerical value associated with the key.	
+ */
 native get_vaultdata(const key[], data[] = "", len = 0);
 
-/* Sets a data under given key. */
+
+/**
+ * Sets data for a given key.
+ *
+ * @param key           Key to set the value for
+ * @param data          Data to set for the given key
+ *
+ * @noreturn
+ */
 native set_vaultdata(const key[], const data[] = "");
 
-/* Removes a key from vault.*/
+/**
+ * Removes a key and its data from the vault.
+ *
+ * @param key           Key to remove
+ *
+ * @noreturn
+ */
 native remove_vaultdata(const key[]);
 
-/* Checks if a key exists in the vault.*/
+/**
+ * Checks if a key exists in the vault.
+ *
+ * @param key           Key to check
+ *
+ * @return              1 if an entry was found, 0 otherwise.
+ */
 native vaultdata_exists(const key[]);