FIX: Missing release suffix in Sphinx documentation

[reneme]

... and celebrate a few new-year's eves.

[codecov-commenter]

Codecov Report

Merging #3018 (3fb8b40) into master (dc0a59c) will increase coverage by 0.01%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3018      +/-   ##
==========================================
+ Coverage   92.61%   92.62%   +0.01%     
==========================================
  Files         596      596              
  Lines       69779    69779              
  Branches     6614     6615       +1     
==========================================
+ Hits        64623    64632       +9     
+ Misses       5123     5114       -9     
  Partials       33       33              

Impacted Files	Coverage Δ
src/fuzzer/mode_padding.cpp	93.65% <0.00%> (-6.35%)	:arrow_down:
src/lib/pubkey/dl_group/dl_group.cpp	91.57% <0.00%> (-1.06%)	:arrow_down:
src/lib/tls/tls12/tls_channel_impl_12.cpp	89.33% <0.00%> (+0.28%)	:arrow_up:
src/lib/misc/cryptobox/cryptobox.cpp	95.89% <0.00%> (+1.36%)	:arrow_up:
src/fuzzer/ressol.cpp	92.85% <0.00%> (+7.14%)	:arrow_up:
src/lib/utils/cpuid/cpuid_x86.cpp	88.31% <0.00%> (+11.68%)	:arrow_up:
src/lib/utils/thread_utils/semaphore.cpp	100.00% <0.00%> (+30.76%)	:arrow_up:

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