typo

git-svn-id: https://svn.r-project.org/R/trunk@87253 00db46b3-68df-0310-9c12-caf00c1e9a41

Author: maechler

doc/manual/R-exts.texi

@@ -13348,7 +13348,7 @@ is modified it may suffice to call @code{shallow_duplicate}.
 @apifun duplicate
 @apifun shallow_duplicate
 
-@comment FIXME need a separate seciton on attributes
+@comment FIXME need a separate section on attributes
 At times it may be necessary to copy attributes from one object to
 another.  This can be done using @code{DUPLICATE_ATTRIB} or
 @code{SHALLOW_DUPLICATE_ATTRIB}