Fix src-element.3 error range

[xorye]

Fixes #420

Upon looking at how this error is handled in IntelliJ and Eclipse, this is what I found:

IntelliJ
For xsd, there is no error
For xml, there is an error on the b tag name

Eclipse
For xsd, the error is on the whole line that contains <xs:element name="a" type="xs:integer">
For xml, there is no error.

This fix displays an error for both xsd and xml.

The error ranges look like the following:
xml:

xsd:

Signed-off-by: David Kwon [email protected]

[angelozerr]

Thanks @xorye for your fix, it's perfect.