Kconfig: Various typo/grammar/line-length fixes in Config*.in files

Non-functional changes to config/Config-*.in files, including:

* spelling mistakes
* inconsistent terminology
* grammar
* overly long lines in "help" components

Signed-off-by: Robert P. J. Day <rpjday@crashcourse.ca>


git-svn-id: svn://svn.openwrt.org/openwrt/trunk@42519 3c298f89-4303-0410-b956-a3cf2f4a3e73