Fix HTML syntax

Author: seisman

index.rst

@@ -177,7 +177,7 @@
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                   2026-07-15:
-                  The first PyGMT paper has been published in *Geochemistry, Geophysics, Geosystems* and is Open Access:
+                  The first PyGMT paper has been published in Geochemistry, Geophysics, Geosystems and is Open Access:
                   <a href="https://doi.org/10.1029/2026GC013105" target="_blank">PyGMT: Bridging Python and the Generic Mapping Tools for Geospatial Visualization and Analysis</a>.
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