Closes twbs#18353. Updated SRI hashes in docs.

Used https://www.srihash.org/.

Author: mikexstudios

_config.yml

@@ -29,8 +29,8 @@ expo:             http://expo.getbootstrap.com
 cdn:
   # See https://www.srihash.org for info on how to generate the hashes
   css:            https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css
-  css_hash:       "sha512-dTfge/zgoMYpP7QbHy4gWMEGsbsdZeCXz7irItjcC3sPUFtf0kuFbDz/ixG7ArTxmDjLXDmezHubeNikyKGVyQ=="
+  css_hash:       "sha384-1q8mTJOASx8j1Au+a5WDVnPi2lkFfwwEAa8hDDdjZlpLegxhjVME1fgjWPGmkzs7"
   css_theme:      https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap-theme.min.css
-  css_theme_hash: "sha384-aUGj/X2zp5rLCbBxumKTCw2Z50WgIr1vs/PFN4praOTvYXWlVyh2UtNUU0KAUhAX"
+  css_theme_hash: "sha384-fLW2N01lMqjakBkx3l/M9EahuwpSfeNvV63J5ezn3uZzapT0u7EYsXMjQV+0En5r"
   js:             https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js
-  js_hash:        "sha512-K1qjQ+NcF2TYO/eI3M6v8EiNYZfA95pQumfvcVrTHtwQVDG+aHRqLi/ETn2uB+1JqwYqVG3LIvdm9lj6imS/pQ=="
+  js_hash:        "sha384-0mSbJDEHialfmuBBQP6A4Qrprq5OVfW37PRR3j5ELqxss1yVqOtnepnHVP9aJ7xS"