badwords: re-sync with curl-www, fix issues found

Also:
- replace `manpage` with `man page`, add to `badwords.txt`.
- badwords.pl: import `-w` feature from curl-www, syncing the two
  scripts fully.
- badwords.txt: import missing items from curl-www, syncing the two
  files fully.
- pyspelling.words: drop `cURL` allowed word.

Closes #19468

lib/asyn-ares.c

@@ -88,7 +88,7 @@
 /* How long we are willing to wait for additional parallel responses after
    obtaining a "definitive" one. For old c-ares without getaddrinfo.
 
-   This is intended to equal the c-ares default timeout. cURL always uses that
+   This is intended to equal the c-ares default timeout. curl always uses that
    default value. Unfortunately, c-ares does not expose its default timeout in
    its API, but it is officially documented as 5 seconds.
 

lib/vtls/openssl.c

@@ -2395,7 +2395,7 @@ static CURLcode ossl_verifyhost(struct Curl_easy *data,
 
         switch(target) {
         case GEN_DNS: /* name/pattern comparison */
-          /* The OpenSSL manpage explicitly says: "In general it cannot be
+          /* The OpenSSL man page explicitly says: "In general it cannot be
              assumed that the data returned by ASN1_STRING_data() is null
              terminated or does not contain embedded nulls." But also that
              "The actual format of the data will depend on the actual string
@@ -4126,7 +4126,7 @@ CURLcode Curl_ossl_ctx_init(struct ossl_ctx *octx,
 
   /* OpenSSL contains code to work around lots of bugs and flaws in various
      SSL-implementations. SSL_CTX_set_options() is used to enabled those
-     work-arounds. The manpage for this option states that SSL_OP_ALL enables
+     work-arounds. The man page for this option states that SSL_OP_ALL enables
      all the work-arounds and that "It is usually safe to use SSL_OP_ALL to
      enable the bug workaround options if compatibility with somewhat broken
      implementations is desired."