Merge branch 'bugfix/gridgeometry-thread-safe-lazy-initializer' into 'master'

Bugfix/gridgeometry thread safe lazy initializer

Closes #1148

See merge request !3087

(cherry picked from commit 2e85f7b1)

74a66846 [doc][gridgeometry] Fix typos in code doc
a63f1f40 [bugfix][gridgeometry] Make lazy initializer of elementMap/bBoxTree thread-safe