[DOC] test/snippet/io/{alignment => sam}_file

[marehr]

Part of many small rename PRs, tackles seqan/product_backlog#290.

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[codecov]

Codecov Report

Merging #2409 (65beda6) into master (49d8b30) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #2409   +/-   ##
=======================================
  Coverage   98.20%   98.20%           
=======================================
  Files         266      266           
  Lines       10831    10831           
=======================================
  Hits        10637    10637           
  Misses        194      194           

Impacted Files	Coverage Δ
.../seqan3/alphabet/composite/alphabet_tuple_base.hpp	100.00% <ø> (ø)
include/seqan3/io/alignment_file/detail.hpp	96.92% <ø> (ø)
include/seqan3/io/alignment_file/input.hpp	100.00% <ø> (ø)
include/seqan3/io/alignment_file/misc.hpp	100.00% <ø> (ø)
include/seqan3/io/alignment_file/output.hpp	100.00% <ø> (ø)
...de/seqan3/io/alignment_file/sam_tag_dictionary.hpp	100.00% <ø> (ø)

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