whitespace fixes

- replace tabs with spaces where possible
- remove line ending spaces
- remove double/triple newlines at EOF
- fix a non-UTF-8 character
- cleanup a few indentations/line continuations
  in manual examples

Closes https://github.com/curl/curl/pull/3037

scripts/log2changes.pl

@@ -14,7 +14,7 @@ sub nicedate {
     return $date;
 }
 
-print 
+print
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