docs: port the changes by chait from 2.4 to 2.6 in functions.md

stylistic change

grammatical, stylistic and one spelling change.

Minor changes - grammatical, stylistic

grammatical, stylistic and added tumbling window to concept of "flip time" window.

grammatical and stylistic changes.

ver-2.6.0.0: change version number

docs: merge missing changes from develop to 2.6

Rephrased a sentence and 2 phrases

Fixed some formatting errors on the TDinsight page.

Fixing a broken link in the Kafka documentation.

Rephrased the intro paragraph for the EMQX broker page.

Fixed some typos on the Grafana page.

docs: change city names in docs-examples

Minor grammar updates and typos to schema less page.

Fixed a typo in one of the notes of the File Directory Structure page.

Minor formatting changes to the Config Parameters page

Fixed a note block that was mis-formatted for Docker Images page.

Fixed a link and fixed typo with SanDiego for Deploy TDengine in Docker page

Re-phrased some of the TDengine Command Line (CLI) page

Modified some phrasing and fixed a link to point to TDengine for page Reference > taosdump

Changed two taosdata links to TDengine links

A couple formatting fixes for the Python Connector page.

Noticed that San Diego was spelled wrong.