README.md: Update text as per the repository's rename and scope

The change also uses a reasonable line length.

Signed-off-by: Andrei Gherzan <andrei.gherzan@huawei.com>

README.md

-# meta-python-dunfellplus
+# meta-python-extra
 
 ## Introduction
 
-This layer is intended to be an extension to the meta-python dunfell branch. This is because dunfell is an LTS version and more projects, with various python modules requirements will levitate more on this version. This layer will provide additional modules, additional versions or various other functionality backported from meta-python master.
+This layer is intended to be an extension to the meta-python layer. It
+(meta-python-extra) will provide additional modules, versions or various other
+functionality backported from meta-python later branches. It does that by
+maintaining equivalent LTS branches (e.g. dunfell) where this support is
+maintained.
 
-The aim of this is to minimise duplication on python recipes backporting on other layers. For example, meta-homeassistant.
+The aim of this is to minimise duplication on python recipes backporting on
+other layers. For example, meta-homeassistant.
 
 ## Dependencies
 
-The meta-python-dunfellplus layer depends on:
+The meta-python-extra layer depends on:
 
 * URI: git://git.openembedded.org/openembedded-core
   * layers: meta
@@ -27,7 +32,9 @@ Please follow the recommended setup procedures of your OE distribution.
 
 ## Contributing
 
-Contributions to this layer are to be handled as merge requests in the Gitlab instance where the layer is hosted: https://git.ostc-eu.org/OSTC/OHOS/meta-python-dunfellplus.
+Contributions to this layer are to be handled as merge requests in the Gitlab
+instance where the layer is hosted:
+https://git.ostc-eu.org/OSTC/OHOS/meta-python-extra.
 
 ## Maintenance