fix syntax

Author: sbgraves237

man/OCC1950.Rd

@@ -60,8 +60,9 @@ NOTE:  In the 2020-03-17 extraction, there were 283 OCC1950 codes documented, bu
 \source{
   Steven Ruggles, Sarah Flood, Ronald Goeken, 
     Josiah Grover, Erin Meyer, Jose Pacas, and 
-    Matthew Sobek (2020) 
-    \doi{10.18128/D010.V10.0}{IPUMS USA: Version 10.0 [dataset]. Minneapolis, MN: IPUMS}. 
+    Matthew Sobek (2020) \doi{10.18128/D010.V10.0} 
+    IPUMS USA: Version 10.0 [dataset]. Minneapolis, 
+    MN: IPUMS. 
 }
 %\references{}
 \examples{