Simplify and clarify credit text and link

Use the name "Kitware" rather than "Kitware, Inc." to simplify the text.
Provide a CMake-specific URL.
Merge branch 'cmake-credits' into release
Merge topic 'cmake-credits'

8da0a75b Simplify and clarify credit text and link
Merge branch 'release'
Simplify and clarify credit text and link

Use the name "Kitware" rather than "Kitware, Inc." to simplify the text.
Provide a CMake-specific URL.
Merge topic 'cmake-credits'

889f2fd8 Simplify and clarify credit text and link
Merge branch 'cmake-credits' into release
Merge branch 'release'