Add man page for sysctl service.

[bcr]

A few language fixes, but nothing major.

lib/libcasper/services/cap_sysctl/cap_sysctl.3

44

s/are/is/

The "respectively" is not needed here, so you can just leave it out.

58

the element

59

the element

63

add another (Oxford) comma here.

68

... to fetch the value of a given sysctl.

71

... override the value of a given sysctl.

78

... read and write the value of a given sysctl.

81

... allows access to all children of a given sysctl.

87

... to get the value of ...

[oshogbo]

Thank you @bcr .

[bcr]

Approved for commit. Thank you for taking the time to write the man page.