Fix broken links

Author: komainu8

_ja/overviews/parallel-collections/ctries.md

@@ -141,5 +141,5 @@ language: ja
 3. [Methods of computing square roots][3]
 
   [1]: https://infoscience.epfl.ch/record/166908/files/ctries-techreport.pdf "Ctries-techreport"
-  [2]: https://lampwww.epfl.ch/~prokopec/ctries-snapshot.pdf "Ctries-snapshot"
+  [2]: http://lampwww.epfl.ch/~prokopec/ctries-snapshot.pdf "Ctries-snapshot"
   [3]: https://en.wikipedia.org/wiki/Methods_of_computing_square_roots#Babylonian_method "babylonian-method"

_overviews/parallel-collections/ctries.md

@@ -173,6 +173,6 @@ Additionally, size computation for parallel concurrent tries is performed in par
 4. [Game of Life simulation][4]
 
   [1]: https://infoscience.epfl.ch/record/166908/files/ctries-techreport.pdf "Ctries-techreport"
-  [2]: https://lampwww.epfl.ch/~prokopec/ctries-snapshot.pdf "Ctries-snapshot"
+  [2]: http://lampwww.epfl.ch/~prokopec/ctries-snapshot.pdf "Ctries-snapshot"
   [3]: https://en.wikipedia.org/wiki/Methods_of_computing_square_roots#Babylonian_method "babylonian-method"
   [4]: https://github.com/axel22/ScalaDays2012-TrieMap "game-of-life-ctries"

_ru/overviews/parallel-collections/ctries.md

@@ -118,6 +118,6 @@ num: 4
 4. [Симуляция игры "Жизнь"][4]
 
   [1]: https://infoscience.epfl.ch/record/166908/files/ctries-techreport.pdf "Ctries-techreport"
-  [2]: https://lampwww.epfl.ch/~prokopec/ctries-snapshot.pdf "Ctries-snapshot"
+  [2]: http://lampwww.epfl.ch/~prokopec/ctries-snapshot.pdf "Ctries-snapshot"
   [3]: https://en.wikipedia.org/wiki/Methods_of_computing_square_roots#Babylonian_method "babylonian-method"
   [4]: https://github.com/axel22/ScalaDays2012-TrieMap "game-of-life-ctries"