Fix typo (and test readthedocs.io build)

Fix a simple typo, and see whether my account permissions allow the docs to build correctly on readthedocs.io

Signed-off-by: Michael Tiemann <72577720+MichaelTiemannOSC@users.noreply.github.com>

docs/getting/index.rst

@@ -7,7 +7,7 @@ The getting started guide aims to get you using pint-pandas productively as quic
 What is Pint-pandas?
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-The Pandas package provides powerful DataFrame and Series abstractions for dealing with numerical, temporal, categorical, string-based, and even user-defined data (using its ExtensionArray feature). The Pint package provides a rich and extensible vocabulary of units for constructing Quantities and an equally rich and extensible range of unit conversions to make it easy to perform unit-safe calculations using Quantities. Pint-pandas provides PintArray, aPandas ExtensionArray that efficiently implements Pandas DataFrame and Series functionality as unit-aware operations where appropriate.
+The Pandas package provides powerful DataFrame and Series abstractions for dealing with numerical, temporal, categorical, string-based, and even user-defined data (using its ExtensionArray feature). The Pint package provides a rich and extensible vocabulary of units for constructing Quantities and an equally rich and extensible range of unit conversions to make it easy to perform unit-safe calculations using Quantities. Pint-pandas provides PintArray, a Pandas ExtensionArray that efficiently implements Pandas DataFrame and Series functionality as unit-aware operations where appropriate.
 
 Those who have used Pint know well that good units discipline often catches not only simple mistakes, but sometimes more fundamental errors as well. Pint-pandas can reveal similar errors when it comes to slicing and dicing Pandas data.