DOC: re-phrase web README.md ENG (#48720)

* update wording readme.md

* refine http server instruction

Author: anonmouse1

web/README.md

@@ -5,8 +5,7 @@ containing the settings to build the website. The website is generated with the
 command `./pandas_web.py pandas`. See `./pandas_web.py --help` and the header of
 the script for more information and options.
 
-After building the website, to navigate it, it is needed to access the web using
-an http server (a not open the local files with the browser, since the links and
+After building the website, a local http server is needed to access the built website (it is not possible to open the local files with the browser, since the links and
 the image sources are absolute to where they are served from). The easiest way
 to run an http server locally is to run `python -m http.server` from the
 `web/build/` directory.