Plugin author, description and version are available

via I_S.PLUGINS, not via SHOW PLUGINS.

include/mysql/plugin.h

@@ -396,12 +396,12 @@ struct st_mysql_plugin
   int type;             /* the plugin type (a MYSQL_XXX_PLUGIN value)   */
   void *info;           /* pointer to type-specific plugin descriptor   */
   const char *name;     /* plugin name                                  */
-  const char *author;   /* plugin author (for SHOW PLUGINS)             */
-  const char *descr;    /* general descriptive text (for SHOW PLUGINS ) */
+  const char *author;   /* plugin author (for I_S.PLUGINS)              */
+  const char *descr;    /* general descriptive text (for I_S.PLUGINS)   */
   int license;          /* the plugin license (PLUGIN_LICENSE_XXX)      */
   int (*init)(void *);  /* the function to invoke when plugin is loaded */
   int (*deinit)(void *);/* the function to invoke when plugin is unloaded */
-  unsigned int version; /* plugin version (for SHOW PLUGINS)            */
+  unsigned int version; /* plugin version (for I_S.PLUGINS)             */
   struct st_mysql_show_var *status_vars;
   struct st_mysql_sys_var **system_vars;
   void * __reserved1;   /* reserved for dependency checking             */