[GRASS-git] [OSGeo/grass-website] 415e34: Fix syntax of target blank (#155)

[Vaclav Petras]

  Branch: refs/heads/master
  Home:   https://github.com/OSGeo/grass-website
  Commit: 415e34d6c494f688b7ad5cbd477da2dfcc788d30
      https://github.com/OSGeo/grass-website/commit/415e34d6c494f688b7ad5cbd477da2dfcc788d30
  Author: Vaclav Petras <wenzeslaus at gmail.com>
  Date:   2020-05-31 (Sun, 31 May 2020)

  Changed paths:
    M content/learn/books.md

  Log Message:
  -----------
  Fix syntax of target blank (#155)

Changes target-"_blank" to target="_blank".