misc: spelling fixes

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

Closes #8647

src/tool_cb_wrt.c

@@ -95,7 +95,7 @@ bool tool_create_output_file(struct OutStruct *outs,
       }
       memcpy(newname, fname, len);
       newname[len] = '.';
-      while(fd == -1 && /* haven't sucessfully opened a file */
+      while(fd == -1 && /* haven't successfully opened a file */
             (errno == EEXIST || errno == EISDIR) &&
             /* because we keep having files that already exist */
             next_num < 100 /* and we haven't reached the retry limit */ ) {

src/tool_cfgable.h

@@ -291,7 +291,7 @@ struct OperationConfig {
   bool disallow_username_in_url;  /* disallow usernames in URLs */
   char *aws_sigv4;
   enum {
-    CLOBBER_DEFAULT, /* Provides compatability with previous versions of curl,
+    CLOBBER_DEFAULT, /* Provides compatibility with previous versions of curl,
                         by using the default behavior for -o, -O, and -J.
                         If those options would have overwritten files, like
                         -o and -O would, then overwrite them. In the case of