Improve comments for clarity

backend/templates/_location.conf

@@ -13,16 +13,21 @@
     {% assign forward_path_end_char = forward_path | slice: -1 %}
     {% if location_path_end_char == "/" and forward_path_end_char != "/" %}
       if ($request_uri ~ "{{ path }}(.*$)") {
-        # Location path ends with / but forward path doesn't, so we prefix $path_remainder with a slash.
+        # Location path ends with / so the regex match will exclude that slash from the match,
+        # but forward path doesn't, so we must prefix $path_remainder with a slash.
         set  $uri_remainder  /$1;
       }
     {% elsif location_path_end_char != "/" and forward_path_end_char == "/" %}
-      # Location path does not have a trailing / but forward path does, so we make sure to capture $uri_remainder without a leading slash.
+      # Location path does not have a trailing / but forward path does,
+      # so we make sure to capture $uri_remainder without a leading slash.
       if ($request_uri ~ "{{ path }}/(.*$)") {
         set  $uri_remainder  $1;
       }
     {% else %}
-      # Either both location path and forward path have a trailing /, or neither do, so we make sure to capture $uri_remainder with a leading slash (if it has one).
+      # Either both location path and forward path have a trailing /, or neither do.
+      # If both do, then we need to capture $uri_remainder without a leading /, but if neither do,
+      # then we need to capture $uri_remainder with a leading slash (if it has one - it could just be some GET parameters).
+      # The code for both scenarios happens to be the same.
       if ($request_uri ~ "{{ path }}(.*$)") {
         set  $uri_remainder  $1;
       }