doc/extension.rdoc: Fix small copy+paste mistake
[Fix GH-1884] From: Lars Kanis <lars@greiz-reinsdorf.de> git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@63622 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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@ -746,7 +746,7 @@ be assigned to sval, which should be a pointer of the type specified.
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==== Ruby object to C struct
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To retrieve the C pointer from the Data object, use the macro
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Data_Get_Struct().
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TypedData_Get_Struct().
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TypedData_Get_Struct(obj, type, &data_type, sval)
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