Fix doc.

sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/regexpExpressions.scala

@@ -158,18 +158,18 @@ case class Like(left: Expression, right: Expression) extends StringRegexExpressi
       regexp - a string expression. The pattern string should be a Java regular expression.
 
         Since Spark 2.0, string literals (including regex patterns) are unescaped in our SQL parser.
-        For example, if the `str` parameter is "abc\td", the `regexp` can match it is:
-        "^abc\\\\td$".
+        For example, if to match "abc\td", a regular expression for `regexp` can be "^abc\\\\td$".
+
+        There is a SQL config 'spark.sql.parser.escapedStringLiterals' that can be used to fallback
+        to the Spark 1.6 behavior regarding string literal parsing. For example, if the config is
+        enabled, the `regexp` that can match "abc\td" is "^abc\\t$".
 
     Examples:
+      When spark.sql.parser.escapedStringLiterals is disabled (default).
       > SELECT '%SystemDrive%\Users\John' _FUNC_ '%SystemDrive%\\Users.*'
       true
 
-        There is a SQL config 'spark.sql.parser.escapedStringLiterals' can be used to fallback
-        to Spark 1.6 behavior regarding string literal parsing. For example, if the config is
-        enabled, the `regexp` can match "abc\td" is "^abc\\t$".
-
-    Examples (spark.sql.parser.escapedStringLiterals is enabled):
+      When spark.sql.parser.escapedStringLiterals is enabled.
       > SELECT '%SystemDrive%\Users\John' _FUNC_ '%SystemDrive%\Users.*'
       true