Added docs for enlist-input filter operator (#4966)

editions/tw5.com/tiddlers/filters/enlist-input Operator.tid

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+caption: enlist-input
+created: 20201102215459192
+modified: 20201102221854719
+op-input: a [[selection of titles|Title Selection]]
+op-output: the titles stored as a [[title list|Title List]] in each input title
+op-purpose: select titles by interpreting each input title as a [[title list|Title List]]
+tags: [[Filter Operators]] [[String Operators]] [[Selection Constructors]]
+title: enlist-input Operator
+type: text/vnd.tiddlywiki
+
+<<.from-version "5.1.23">>
+
+<<.tip " Compare with [[enlist|enlist Operator]] operator that interprets its operand as a title list">>
+
+```
+<$vars days={{{ [[Days of the Week]get[list]] }}}>
+
+{{{ [enlist<days>] }}}
+
+</$vars>
+```
+
+is equivalent to:
+
+```
+{{{ [[Days of the Week]get[list]enlist-input[]] }}}
+```
+
+<<.operator-examples "enlist-input">>

editions/tw5.com/tiddlers/filters/examples/enlist-input Operator (Examples).tid

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+created: 20201102220519567
+modified: 20201102221137200
+tags: [[enlist-input Operator]] [[Operator Examples]]
+title: enlist-input Operator (Examples)
+type: text/vnd.tiddlywiki
+
+<<.operator-example 1 "[[Days of the Week]get[list]enlist-input[]]">>
+<<.operator-example 2 "'HelloThere GettingStarted [[Customise TiddlyWiki]]' +[enlist-input[]]">>