removed quote causing rendering issues (dotnet#1407)

Author: mairaw

docs/visual-basic/language-reference/data-types/string-data-type.md

@@ -25,7 +25,7 @@ helpviewer_keywords:
   - "fixed-length strings"
   - "string literals"
   - "data types [Visual Basic], assigning"
-  - "" String literals"
+  - "String literals"
   - "identifier type characters, $"
 ms.assetid: 15ac03f5-cabd-42cc-a754-1df3893c25d9
 caps.latest.revision: 19
@@ -107,4 +107,4 @@ S = Microsoft.VisualBasic.Left(S, 4)
  [Type Conversion Functions](../../../visual-basic/language-reference/functions/type-conversion-functions.md)   
  [Conversion Summary](../../../visual-basic/language-reference/keywords/conversion-summary.md)   
  [How to: Call a Windows Function that Takes Unsigned Types](../../../visual-basic/programming-guide/com-interop/how-to-call-a-windows-function-that-takes-unsigned-types.md)   
- [Efficient Use of Data Types](../../../visual-basic/programming-guide/language-features/data-types/efficient-use-of-data-types.md)
+ [Efficient Use of Data Types](../../../visual-basic/programming-guide/language-features/data-types/efficient-use-of-data-types.md)