Typo fix - update to .NET regular expressions article (#33839)

Change (... "Mrs. ", "Miss ", "Ms or "Ms. ".) to (..."Mrs. ", "Miss ", "Ms ", or "Ms. ".). This adds space and closing quotation mark to (Ms).

Author: mahab339

docs/standard/base-types/regular-expressions.md

@@ -76,7 +76,7 @@ The <xref:System.String> class includes string search and replacement methods th
  [!code-csharp[Conceptual.Regex#2](~/samples/snippets/csharp/VS_Snippets_CLR/conceptual.regex/cs/example1.cs#2)]
  [!code-vb[Conceptual.Regex#2](~/samples/snippets/visualbasic/VS_Snippets_CLR/conceptual.regex/vb/example1.vb#2)]  
 
- The regular expression pattern `(Mr\.? |Mrs\.? |Miss |Ms\.? )` matches any occurrence of "Mr ", "Mr. ", "Mrs ", "Mrs. ", "Miss ", "Ms or "Ms. ". The call to the <xref:System.Text.RegularExpressions.Regex.Replace%2A?displayProperty=nameWithType> method replaces the matched string with <xref:System.String.Empty?displayProperty=nameWithType>; in other words, it removes it from the original string.  
+ The regular expression pattern `(Mr\.? |Mrs\.? |Miss |Ms\.? )` matches any occurrence of "Mr ", "Mr. ", "Mrs ", "Mrs. ", "Miss ", "Ms ", or "Ms. ". The call to the <xref:System.Text.RegularExpressions.Regex.Replace%2A?displayProperty=nameWithType> method replaces the matched string with <xref:System.String.Empty?displayProperty=nameWithType>; in other words, it removes it from the original string.  
 
 ### Example 2: Identify duplicated words