Fix malformed javadoc

See gh-9000

spring-boot/src/main/java/org/springframework/boot/context/properties/source/ConfigurationPropertyName.java

@@ -29,8 +29,8 @@ import org.springframework.util.StringUtils;
 
 /**
  * A configuration property name composed of elements separated by dots. Names may contain
- * the characters ("{@code a-z}" "{@code 0-9}") & "{@code -}", they must be lower-case and
- * must start with a letter. The "{@code -}" is used purely for formatting, i.e.
+ * the characters "{@code a-z}" "{@code 0-9}") and "{@code -}", they must be lower-case
+ * and must start with a letter. The "{@code -}" is used purely for formatting, i.e.
  * "{@code foo-bar}" and "{@code foobar}" are considered equivalent.
  * <p>
  * The "{@code [}" and "{@code ]}" characters may be used to indicate an associative