Clean up extra whitespace in README.md

Author: v-dobrev

README.md

@@ -39,7 +39,7 @@ These examples were tested and verified against [email protected].
 | tasmanian/example_unstructured_grid.cpp               | Tasmanian+MAGMA          | Constructs a sparse grid model from random data   | ![cuda] ![hip] |
 | trilinos/SimpleSolve_WithParameters.cpp               | Trilinos+SuperLU_Dist    | Small linear system direct solution               |                |
 | strumpack/sparse.cpp                                  | STRUMPACK+ButterflyPACK  | 3D Poisson problem with STRUMPACK preconditioner  |                |
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 ## Installing the Examples