More function documentation

git-svn-id: svn://svn.code.sf.net/p/magicseteditor/code/trunk@568 0fc631ac-6414-0410-93d0-97cfa31319b6

doc/function/contains.txt

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+Function: contains
+
+--Usage--
+> contains(some_string, match: to_search_for)
+
+Does one string contain another at any position?
+
+--Parameters--
+| @input@	[[type:string]]		String to look in
+| @match@	[[type:string]]		String to look for
+
+--Examples--
+> contains("abcdefg", match:"abc")    == true
+> contains("abcdefg", match:"defg")   == true
+> contains("abcdefg", match:"abd")    == false
+
+--See also--
+| [[fun:match|match / match_rule]]	Does a string match a regular expression?