document CSVREAD "null" option better

h2/src/docsrc/help/help.csv

@@ -1803,12 +1803,30 @@ combined into a space separated key-value pairs, as follows:
 ""STRINGDECODE('charset=UTF-8 escape=\"" fieldDelimiter=\"" fieldSeparator=, ' ||""
 ""'lineComment=# lineSeparator=\n null= rowSeparator=')"".
 The following options are supported:
+
 ""caseSensitiveColumnNames"" (true or false; disabled by default),
-""charset"", ""escape"", ""fieldDelimiter"", ""fieldSeparator"",
+
+""charset"", 
+
+""escape"", 
+
+""fieldDelimiter"", 
+
+""fieldSeparator"",
+
 ""lineComment"" (disabled by default),
-""lineSeparator"", ""null"", ""rowSeparator"" (not set by default),
+
+""lineSeparator"", 
+
+""null"", Note that an empty value is always treated as null.
+This feature for compatibility, it is only here to support reading existing CSV files that contain explicit "null" delimiters.
+
+""rowSeparator"" (not set by default),
+
 ""preserveWhitespace"" (true or false; disabled by default),
+
 ""writeColumnHeader"" (true or false; enabled by default).
+
 For a newline or other special character, use STRINGDECODE as in the example above.
 A space needs to be escaped with a backslash (""'\ '""), and
 a backslash needs to be escaped with another backslash (""'\\'"").