docs: highlightsjs version downgraded in order to fix ie 11 (#2573)

* fix: highlightsjs version downgraded in order to fix ie 11

* chore: update package-lock.json

Co-authored-by: Droshev <i820906@MacBook-Pro.local>

package.json

@@ -3,7 +3,7 @@
   "version": "0.18.1-rc.29",
   "license": "Apache-2.0",
   "main": "dist/libs/core/index.js",
-  "description": "Fundamental Library for Angular is a themable Fiori 3 Angular component library",
+  "description": "Fundamental Library for Angular is a themable Fiori 3 Angular component library.",
   "homepage": "https://sap.github.io/fundamental-ngx",
   "repository": {
     "type": "git",
@@ -92,7 +92,7 @@
     "flexboxgrid": "6.3.1",
     "focus-trap": "5.1.0",
     "fundamental-styles": "0.8.1",
-    "highlight.js": "10.0.3",
+    "highlight.js": "9.18.1",
     "intl": "^1.2.5",
     "jasminewd2": "2.2.0",
     "moment": "2.25.3",
@@ -163,4 +163,4 @@
     ],
     "silent": false
   }
-}
+}