Reupdate full/partial completion to signal_wait_until

We were addressing the partial update completions in the apinotes
for the shmem_wait_until_signal op. To be consistent with other
sync operations - moving to the description section.

This commit was previously pushed in the openshmem-org:master and
it had a hash clash and the change wasn;t pushed in the master
branch. We are fixing it.

content/shmem_signal_wait_until.tex

@@ -33,18 +33,15 @@
     blocks until the value of \VAR{sig\_addr} at the calling \ac{PE} satisfies
     the wait condition specified by the comparison operator, \VAR{cmp}, and
     comparison value, \VAR{cmp\_value}.
+
+    Implementations must ensure that \FUNC{shmem\_signal\_wait\_until} do not
+    return before the update of the memory indicated by \VAR{sig\_addr} is
+    fully complete.
 }
 
 \apireturnvalues{
     Return the contents of the signal data object, \VAR{sig\_addr}, at the
     calling \ac{PE} that satisfies the wait condition.
 }
 
-\apiimpnotes{
-    Implementations must ensure that \FUNC{shmem\_signal\_wait\_until} do not
-    return before the update of the memory indicated by \VAR{sig\_addr} is fully
-    complete. Partial updates to the memory must not cause
-    \FUNC{shmem\_signal\_wait\_until} to return.
-}
-
 \end{apidefinition}