tidy-up: miscellaneous

- cmake/Find*: make double quotes consistent.
- drop redundant parenthesis.
- GHA/checksrc: sync a step name with others.
- whitespace.

Closes #19233

docs/examples/log_failed_transfers.c

@@ -130,7 +130,7 @@ static int mem_add(struct mem *mem, const char *str)
 }
 
 #if defined(__GNUC__) || defined(__clang__)
-__attribute__ ((format (printf, 2, 3)))
+__attribute__((format(printf, 2, 3)))
 #endif
 static int mem_addf(struct mem *mem, const char *format, ...)
 {

docs/examples/usercertinmem.c

@@ -176,9 +176,9 @@ int main(void)
 
     /* both VERIFYPEER and VERIFYHOST are set to 0 in this case because there
        is no CA certificate */
-
     curl_easy_setopt(ch, CURLOPT_SSL_VERIFYPEER, 0L);
     curl_easy_setopt(ch, CURLOPT_SSL_VERIFYHOST, 0L);
+
     curl_easy_setopt(ch, CURLOPT_URL, "https://www.example.com/");
     curl_easy_setopt(ch, CURLOPT_SSLKEYTYPE, "PEM");