Update about.html

Author: Gmac4247

about.html

@@ -73,7 +73,7 @@
 <meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0">
 <meta name="description" content="About the context of the Core Geometric System ™, the best-established and most accurate framework to calculate area and volume.">
 <meta name="author" content="Gaál Sándor">
-<meta name="keywords" content="Core Geometric Systems, Accurate Geometric Calculations, Engineering Design Solutions, Computer Graphics Rendering, Algorithm Optimization">
+<meta name="keywords" content="Core Geometric System, Accurate Geometric Calculations, Engineering Design Solutions, Computer Graphics Rendering, Algorithm Optimization, Navigation">
 <meta name="twitter:card" content="summary_large_image">
 <meta name="twitter:creator" content="@gmac4247">
 <meta name="twitter:title" content="About Basic Geometry Formulas">