Fix minor typo in welcome content

Replace "Code QL database" with "CodeQL database" for consistency with [documentation](https://codeql.github.com/docs/codeql-cli/creating-codeql-databases/).

Author: henrymercer

extensions/ql-vscode/package.json

@@ -695,15 +695,15 @@
     "viewsWelcome": [
       {
         "view": "codeQLAstViewer",
-        "contents": "Run the 'CodeQL: View AST' command on an open source file from a Code QL database.\n[View AST](command:codeQL.viewAst)"
+        "contents": "Run the 'CodeQL: View AST' command on an open source file from a CodeQL database.\n[View AST](command:codeQL.viewAst)"
       },
       {
         "view": "codeQLQueryHistory",
         "contents": "Run the 'CodeQL: Run Query' command on a QL query.\n[Run Query](command:codeQL.runQuery)"
       },
       {
         "view": "codeQLDatabases",
-        "contents": "Add a Code QL database:\n[From a folder](command:codeQLDatabases.chooseDatabaseFolder)\n[From an archive](command:codeQLDatabases.chooseDatabaseArchive)\n[From a URL (as a zip file)](command:codeQLDatabases.chooseDatabaseInternet)\n[From LGTM](command:codeQLDatabases.chooseDatabaseLgtm)"
+        "contents": "Add a CodeQL database:\n[From a folder](command:codeQLDatabases.chooseDatabaseFolder)\n[From an archive](command:codeQLDatabases.chooseDatabaseArchive)\n[From a URL (as a zip file)](command:codeQLDatabases.chooseDatabaseInternet)\n[From LGTM](command:codeQLDatabases.chooseDatabaseLgtm)"
       }
     ]
   },