document module unload error codes in comments
@@ -8590,7 +8590,10 @@ int moduleLoad(const char *path, void **module_argv, int module_argc) {
* to the following values depending on the type of error:
*
* * ENONET: No such module having the specified name.
- * * EBUSY: The module exports a new data type and can only be reloaded. */
+ * * EBUSY: The module exports a new data type and can only be reloaded.
+ * * EPERM: The module exports APIs which are used by other module.
+ * * EAGAIN: The module has blocked clients.
+ * * ECANCELED: Unload module error. */
int moduleUnload(sds name) {
struct RedisModule *module = dictFetchValue(modules,name);
