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

src/tool_formparse.h

@@ -30,4 +30,3 @@ int formparse(struct OperationConfig *config,
               bool literal_value);
 
 #endif /* HEADER_CURL_TOOL_FORMPARSE_H */
-