misc: spelling fixes

Mostly in comments but also in the -w documentation for headers_json.

Closes #8647

lib/h2h3.c

@@ -114,7 +114,7 @@ static header_instruction inspect_header(const char *name, size_t namelen,
 }
 
 CURLcode Curl_pseudo_headers(struct Curl_easy *data,
-                             const char *mem, /* the requeset */
+                             const char *mem, /* the request */
                              const size_t len /* size of request */,
                              struct h2h3req **hp)
 {

lib/headers.c

@@ -48,10 +48,10 @@ static void copy_header_external(struct Curl_easy *data,
   h->value = hs->value;
   h->amount = amount;
   h->index = index;
-  /* this will randomly OR a reverved bit for the sole purpose of making it
-     impossible for applications to do == comparisons, as that would
-     otherwise be very tempting and then lead the reserved bits not being
-     reserved anymore. */
+  /* this will randomly OR a reserved bit for the sole purpose of making it
+     impossible for applications to do == comparisons, as that would otherwise
+     be very tempting and then lead to the reserved bits not being reserved
+     anymore. */
   h->origin = hs->type | (1<<27);
   h->anchor = e;
 }
@@ -99,7 +99,7 @@ CURLHcode curl_easy_header(CURL *easy,
     return CURLHE_BADINDEX;
 
   if(nameindex == amount - 1)
-    /* if the last or only ocurrance is what's asked for, then we know it */
+    /* if the last or only occurrence is what's asked for, then we know it */
     hs = pick;
   else {
     for(e = data->state.httphdrs.head; e; e = e->next) {

lib/urlapi.c

@@ -1144,7 +1144,7 @@ static CURLUcode parseurl(const char *url, CURLU *u, unsigned int flags)
 }
 
 /*
- * Parse the URL and, if successful, replace everyting in the Curl_URL struct.
+ * Parse the URL and, if successful, replace everything in the Curl_URL struct.
  */
 static CURLUcode parseurl_and_replace(const char *url, CURLU *u,
                                       unsigned int flags)

lib/vtls/sectransp.c

@@ -938,9 +938,9 @@ static OSStatus SocketWrite(SSLConnectionRef connection,
 #ifndef CURL_DISABLE_VERBOSE_STRINGS
 CF_INLINE const char *TLSCipherNameForNumber(SSLCipherSuite cipher)
 {
-  /* The first ciphers in the ciphertable are continuos. Here we do small
+  /* The first ciphers in the ciphertable are continuous. Here we do small
      optimization and instead of loop directly get SSL name by cipher number.
-   */
+  */
   if(cipher <= SSL_FORTEZZA_DMS_WITH_FORTEZZA_CBC_SHA) {
     return ciphertable[cipher].name;
   }