Fix typo installing

Author: Karel-van-de-Plassche

docs/source/installing.rst

@@ -33,7 +33,7 @@ This should give us all we need, namely at time of testing:
 * The Python package installer ``pip``:
   ``pip --version #pip 20.0.2 from /work/imas/opt/EasyBuild/software/Python/3.8.2-GCCcore-9.3.0/lib/python3.8/site-packages/pip-20.0.2-py3.8.egg/pip (python 3.8)``
 
-We are all developers, lets install in `pip editable <https://pip.pypa.io/en/stable/reference/pip_install/#options>`_ /`setuptools develop <https://setuptools.readthedocs.io/en/latest/setuptools.html#development-mode>`_ mode. **We are not using PEP517 build isolation to link to the systems numpy.**, **We are not using PyPA's recommended environment management, but instead install into the USER_SITE, this is ~/.local by default.**
+We are all developers, install imaspy in `pip editable <https://pip.pypa.io/en/stable/reference/pip_install/#options>`_ /`setuptools develop <https://setuptools.readthedocs.io/en/latest/setuptools.html#development-mode>`_ mode. **We are not using PEP517 build isolation to link to the systems numpy.**, **We are not using PyPA's recommended environment management, but instead install into the USER_SITE, this is ~/.local by default.**
 
 .. code-block:: bash