FactResolver: rename short variable cd → minimumDate

`cd` shadows the cd shell builtin in code-search and reads as a typo
in the date formatter, where `minimumDate` makes the role obvious.

Author: magicsunday

src/Processor/FactResolver.php

@@ -177,18 +177,18 @@ private function formatDate(Date $date): string
             return strip_tags($date->display());
         }
 
-        $cd = $date->minimumDate();
+        $minimumDate = $date->minimumDate();
 
-        if ($cd->day() > 0 && $cd->month() > 0) {
-            return $cd->format('%d.%m.%Y');
+        if ($minimumDate->day() > 0 && $minimumDate->month() > 0) {
+            return $minimumDate->format('%d.%m.%Y');
         }
 
-        if ($cd->month() > 0) {
-            return $cd->format('%m.%Y');
+        if ($minimumDate->month() > 0) {
+            return $minimumDate->format('%m.%Y');
         }
 
-        if ($cd->year() > 0) {
-            return $cd->format('%Y');
+        if ($minimumDate->year() > 0) {
+            return $minimumDate->format('%Y');
         }
 
         return strip_tags($date->display());