section/collectives: Reword the shmem_alltoall[s] one-liner intros

Closes openshmem-org#345
jdinan · Feb 6, 2020 · 14e66be · 14e66be
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diff --git a/content/shmem_alltoall.tex b/content/shmem_alltoall.tex
@@ -1,5 +1,6 @@
 \apisummary{
-    shmem\_alltoall is a collective routine where each \ac{PE} exchanges a fixed amount of data with all other \acp{PE} participating in the collective.
+  Exchanges a fixed amount of contiguous data blocks between all pairs
+  of \acp{PE} participating in the collective routine.
 }
 
 \begin{apidefinition}

diff --git a/content/shmem_alltoalls.tex b/content/shmem_alltoalls.tex
@@ -1,5 +1,6 @@
 \apisummary{
-    shmem\_alltoalls is a collective routine where each \ac{PE} exchanges a fixed amount of strided data with all other \acp{PE} participating in the collective.
+  Exchanges a fixed amount of strided data blocks between all pairs
+  of \acp{PE} participating in the collective routine.
 }
 
 \begin{apidefinition}