Update docs.md

Change “需要考虑库的设计，超级表和普通表的设计” to “需要考虑库、超级表和普通表的设计”

Change "IOT" to "IoT".

[TD-5466]<fix> handle invalid Escapes

[TD-6005]<enhance>: test cases

[TD-6001]<enhance>: use db_name in url if exists

refactor python test script

Docs/update latest feature

* [TD-6194]<fix>: taosdemo wrong data

* fix few format mistakes.

[TD-5331] <docs>: move to some other doc space.

[TD-6223]concurrent query support nested query

[TD-6209]<test>add case for TD-6027

[ci skip] update scirpt for csv generator

[TD-6046]<fix> fix ts top/bottom/diff/derivative ts error

[TD-7438]<document>: format document

[TD-6255] <docs>: fix html code typo in English Java doc.

[TD-6255] <docs>: fix minor format things in English Java doc.

[TD-6255]<doc>: java connector english document

* [TD-3197] <fix>: fix taosdemo coverity scan issues.

* [TD-3197] <fix>: fix taosdemo coverity scan issue.

fix subscribeTest pids uninitialized.

* [TD-3197] <fix>: fix taosdemo coverity scan issues.

* [TD-3197] <fix>: fix coverity scan issues.

check super tbl info pointer.

* [TD-3197] <fix>: fix coverity scan issues.

move sub tbl query thread join into loop

* [TD-3197] <fix>: fix coverity scan issues.

remove unused variable

* [TD-3197] <fix>: fix coverity scan issues.

use more secure random library

* [TD-3197] <fix>: fix coverity scan issues.

use strncpy for more safe

* [TD-3197] <fix>: fix taosdemo coverity scan issue.

replace arc4random with rand().

* [TD-3197] <fix>: fix coverity scan issues.

check stb info pointer for start time

* [TD-3197] <fix>: fix coverity scan issues.

fix strcpy vulnerability

* [TD-3197] <fix>: fix taosdemo coverity scan issue.

modify taosdemoTest2. try to check database continously.

* [TD-3197] <fix>: taosdemo coverity scan issues.

* [TD-3197] <fix>: fix memory leak when parsing arguments.

* [TD-3197] <fix>: fix cmake strip arguments.

* [TD-3197] <fix>: taosdemo coverity scan.

fix cmake string manipulation.

* [TD-3197]<fix>: taosdemo coverity scan issue.

configDir buffer overwrite.

* [TD-3197]<fix>: coverity scan issue.

taosdump argument validation.

* [TD-3197]<fix>: taosdemo and taosdump coverity scan issues.

* [TD-3197]<fix>: taosdemo coverity scan.

append result buf to file. for develop branch.

* exit if read sample file failed.

* fix converity scan issue.

* fix coverity scan issue.

* fix coverity scan memory leak.

* fix resource leak reported by coverity scan.

* fix taosdemo coverity scan issue.

* fix tcsetattr and getchar return value determination bug.
Co-authored-by: NShuduo Sang <sdsang@taosdata.com>