Update install instruction for pip (#1531)

* Update pip install command

* Minor update

---------

Co-authored-by: Anton <[email protected]>

Author: DenisScherbakov

README.md

@@ -29,13 +29,11 @@ cd dpnp
 python scripts/build_locally.py
 ```
 
-## Install Wheel Package from Pypi
+## Install Wheel Package via pip
 Install DPNP
 ```cmd
-python -m pip install --index-url https://pypi.anaconda.org/intel/simple --extra-index-url https://pypi.org/simple dpnp
+python -m pip install --index-url https://pypi.anaconda.org/intel/simple dpnp
 ```
-Note: DPNP wheel package is placed on Pypi, but some of its dependencies (like Intel numpy) are in Anaconda Cloud.
-That is why install command requires additional intel Pypi channel from Anaconda Cloud.
 
 Set path to Performance Libraries in case of using venv or system Python:
 ```cmd