clear state in the doc that HiPACE++ is 3D (#840)

Hi-PACE · Dec 16, 2022 · df32837 · df32837
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diff --git a/docs/source/index.rst b/docs/source/index.rst
@@ -4,7 +4,7 @@ HiPACE++
 .. figure:: https://user-images.githubusercontent.com/26292713/144571005-b0ba2624-48ad-4293-a8c1-a19d577c44df.png
  :alt: HiPACE++
 
-HiPACE++ is an open-source portable (GPU-capable) quasistatic particle-in-cell code written in C++, available `here <https://github.com/Hi-PACE/hipace>`__.
+HiPACE++ is a 3D open-source portable (GPU-capable) quasistatic particle-in-cell code written in C++, available `here <https://github.com/Hi-PACE/hipace>`__.
 It is a full re-writing of the DESY-LBNL legacy code `HiPACE <http://dx.doi.org/10.1088/0741-3335/56/8/084012>`__, the Highly efficient Plasma Accelerator Emulator.
 Its main features are: