Update messages & REST API help reference page

Signed-off-by: Pekka Helenius <fincer89@hotmail.com>

Author: Fincer

bookstore/src/main/resources/messages.properties

@@ -70,7 +70,7 @@ page.text.apiref.book.add          = Adding a book
 page.text.apiref.book.add.a        = Without author and category information\:
 page.text.apiref.book.add.b        = With author and category information\:
 page.text.apiref.book.add.c        = Without author and with category information\:
-page.text.apiref.book.add.d        = With author's last name\:
+page.text.apiref.book.add.d        = With author's last name and with category information\:
 
 page.text.apiref.book.info.a       = Category is correctly mapped even if letter case is not correct.
 

bookstore/src/main/resources/templates/apiref.html

@@ -137,7 +137,7 @@ <h3 th:text="${#messages.msgOrNull('page.text.apiref.examples')} ?: 'page.text.a
 
 			<tr>
 				<td class="apiref-table-right">
-					<code th:text="'curl --request GET ' + ${baseUrl} + 'api/authors/search/fullname?firstname=Angela&lastname=Carter'">
+					<code th:text="'curl --request GET &quot;' + ${baseUrl} + 'api/authors/search/fullname?firstname=Angela&lastname=Carter&quot;'">
 					code placeholder
 					</code>
 				</td>