Fill in annotation for EML methods in its schema

[amoeba]

Found this today while spelunking around:

eml/xsd/eml-methods.xsd

Lines 73 to 77 in dd6659f

	<xs:element name="methods" type="MethodsType">
	<xs:annotation>
	<xs:documentation>Comment describing your root element</xs:documentation>
	</xs:annotation>
	</xs:element>

This should get filled or removed. methodStep has some text that I think pertains to both methods and itself, so I think this could get split between the annotations for methods and methodsStep:

eml/xsd/eml-methods.xsd

Lines 80 to 94 in dd6659f

	<xs:element name="methodStep" maxOccurs="unbounded">
	<xs:annotation>
	<xs:appinfo>
	<doc:tooltip>method information</doc:tooltip>
	<doc:summary>Information about the methods employed in collecting
	or generating a data set or other resource.</doc:summary>
	<doc:description>The methodStep field allows for repeated sets of
	elements that document a series of procedures followed to produce a
	data object. These include text descriptions of the procedures,
	relevant literature, software, instrumentation, source data and any
	quality control measures taken.</doc:description>
	<doc:example>Please see the examples for the
	sub-fields.</doc:example>
	</xs:appinfo>
	</xs:annotation>

Anyone wanna have a go?

[mobb]

see commit 913cbbb