[documentation][Finsh]fix the wrong comments for FINSH_USING_SYMTAB macro in markdown files.

Author: GorrayLi

documentation/basic/basic.md

@@ -669,7 +669,7 @@ Configuration is mainly done by modifying the file under project directory - rtc
 /* While turning the system FinSH: define the number of historical command lines. */
 #define FINSH_HISTORY_LINES 5
 
-/* While turning the system FinSH: define this macro to open the Tab key, if not defined, close. */
+/* While turning the system FinSH: define this macro to use symbol table in Finsh, if not defined, close. */
 #define FINSH_USING_SYMTAB
 
 /* While turning the system FinSH: define the priority of the thread. */

documentation/finsh/finsh.md

@@ -421,7 +421,7 @@ The reference configuration example in rtconfig.h is as follows, and can be conf
 /* Record 5 lines of history commands */
 #define FINSH_HISTORY_LINES 5
 
-/* Enable the use of the Tab key */
+/* Enable the use of symbol table */
 #define FINSH_USING_SYMTAB
 /* Turn on description */
 #define FINSH_USING_DESCRIPTION