Fixed Documentation stating unsined int instead of size_t for n_entity() functions

6 jobs for Documentation_size_t_fixes
Status Job ID Name Coverage
  Test
passed #4811
Linux
clang-c++11

00:21:08

passed #4813
Linux
clang-c++98

00:17:05

passed #4810
Linux
gcc-c++11

00:04:49

passed #4812
Linux
gcc-c++98

00:05:26

passed #4814
Apple
macos-c++11

00:15:16

passed #4815
Apple
macos-c++98

00:08:23