tidy-up: miscellaneous

- drop more uses of the word "just". (not enforced here)
- drop some uses of the "will" word.
- "then" -> "than".
- tests/http/testenv/curl.py: fix copy-paste typo in error message.
- pytest: replace `shutdownh` with `shutdown` in test names.
  Spotted by GitHub Code Quality.
- comment typos.
- whitespace and newlines fixes.

Closes #21830

tests/http/testenv/curl.py

@@ -1239,7 +1239,7 @@ class CurlClient:
 
     def _perf_collapse(self, perf: PerfProfile, file_err):
         if not os.path.exists(perf.file):
-            raise Exception(f'dtrace output file does not exist: {perf.file}')
+            raise Exception(f'perf output file does not exist: {perf.file}')
         fg_collapse = os.path.join(self._fg_dir, 'stackcollapse-perf.pl')
         if not os.path.exists(fg_collapse):
             raise Exception(f'FlameGraph script not found: {fg_collapse}')

tests/http/testenv/mod_curltest/mod_curltest.c

@@ -339,7 +339,7 @@ static int curltest_tweak_handler(request_rec *r)
           }
         }
         else if(!strcmp("id", arg)) {
-          /* just an id for repeated requests with curl's URL globbing */
+          /* an id for repeated requests with curl's URL globbing */
           request_id = val;
           continue;
         }
@@ -551,7 +551,7 @@ static int curltest_put_handler(request_rec *r)
         *s = '\0';
         val = s + 1;
         if(!strcmp("id", arg)) {
-          /* just an id for repeated requests with curl's URL globbing */
+          /* an id for repeated requests with curl's URL globbing */
           request_id = val;
           continue;
         }
@@ -748,7 +748,7 @@ static int curltest_sslinfo_handler(request_rec *r)
         *s = '\0';
         val = s + 1;
         if(!strcmp("id", arg)) {
-          /* just an id for repeated requests with curl's URL globbing */
+          /* an id for repeated requests with curl's URL globbing */
           request_id = val;
           continue;
         }
@@ -862,7 +862,7 @@ static int curltest_limit_handler(request_rec *r)
         *s = '\0';
         val = s + 1;
         if(!strcmp("id", arg)) {
-          /* just an id for repeated requests with curl's URL globbing */
+          /* an id for repeated requests with curl's URL globbing */
           request_id = val;
           continue;
         }