[#209] mark end of puzzle body where indentation stops

[mbao01]

Examples:

/*
 * @todo #42 hello
 *  good bye
 * hello again
 */

Puzzle body: hello good bye

[mbao01]

@yegor256 please review

[codecov]

Codecov Report

Merging #210 (3677c24) into master (ba4b803) will decrease coverage by 0.24%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #210      +/-   ##
==========================================
- Coverage   95.77%   95.53%   -0.25%     
==========================================
  Files          10       10              
  Lines         355      358       +3     
==========================================
+ Hits          340      342       +2     
- Misses         15       16       +1     

Impacted Files	Coverage Δ
lib/pdd/source.rb	99.18% <100.00%> (+0.02%)	⬆️
lib/pdd.rb	96.34% <0.00%> (-1.22%)	⬇️

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[yegor256]

@rultor merge

[rultor]

@rultor merge

@yegor256 OK, I'll try to merge now. You can check the progress of the merge here

[yegor256]

@rultor release, tag is 0.21.2

[rultor]

@rultor merge

@yegor256 Done! FYI, the full log is here (took me 2min)

[rultor]

@rultor release, tag is 0.21.2

@yegor256 OK, I will release it now. Please check the progress here

[rultor]

@rultor release, tag is 0.21.2

@yegor256 Done! FYI, the full log is here (took me 2min)