1533: Fix typo in MPI access guard error message

[PhilMiller]

Fixes #1533

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[codecov]

Codecov Report

Merging #1686 (487e500) into develop (bdda95f) will increase coverage by 0.03%.
The diff coverage is 0.00%.

❗ Current head 487e500 differs from pull request most recent head cd8863f. Consider uploading reports for the commit cd8863f to get more accurate results

@@             Coverage Diff             @@
##           develop    #1686      +/-   ##
===========================================
+ Coverage    83.77%   83.80%   +0.03%     
===========================================
  Files          773      772       -1     
  Lines        26871    26861      -10     
===========================================
  Hits         22510    22510              
+ Misses        4361     4351      -10     

Impacted Files	Coverage Δ
tests/unit/runtime/test_mpi_access_guards.cc	88.88% <0.00%> (ø)
src/vt/scheduler/priority_manip.cc	50.00% <0.00%> (-5.56%)	⬇️
src/vt/pipe/pipe_manager.cc	55.55% <0.00%> (-4.45%)	⬇️
src/vt/trace/trace_event.cc	75.00% <0.00%> (-1.20%)	⬇️
src/vt/utils/compress/compressor.cc	83.33% <0.00%> (-0.88%)	⬇️
.../collection/balance/model/proposed_reassignment.cc	80.00% <0.00%> (-0.77%)	⬇️
...vt/vrt/collection/balance/temperedlb/temperedlb.cc	70.26% <0.00%> (-0.22%)	⬇️
src/vt/context/context.cc	100.00% <0.00%> (ø)
src/vt/group/group_info.cc	100.00% <0.00%> (ø)
src/vt/sequence/seq_closure.cc	100.00% <0.00%> (ø)
... and 15 more

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