Makes the cooking machines more forgiving (#5188)

It takes longer until food is burned in the cooking machines.
https://forums.aurorastation.org/viewtopic.php?f=18&t=11818

code/game/machinery/kitchen/cooking_machines/_appliance.dm

@@ -634,7 +634,7 @@
 /datum/cooking_item
 	var/max_cookwork
 	var/cookwork
-	var/overcook_mult = 3
+	var/overcook_mult = 5
 	var/result_type = 0
 	var/obj/item/weapon/reagent_containers/cooking_container/container = null
 	var/combine_target = null

html/changelogs/arrow768-cooker.yml

@@ -0,0 +1,37 @@
+################################
+# Example Changelog File
+#
+# Note: This file, and files beginning with ".", and files that don't end in ".yml" will not be read. If you change this file, you will look really dumb.
+#
+# Your changelog will be merged with a master changelog. (New stuff added only, and only on the date entry for the day it was merged.)
+# When it is, any changes listed below will disappear.
+#
+# Valid Prefixes: 
+#   bugfix
+#   wip (For works in progress)
+#   tweak
+#   soundadd
+#   sounddel
+#   rscadd (general adding of nice things)
+#   rscdel (general deleting of nice things)
+#   imageadd
+#   imagedel
+#   maptweak
+#   spellcheck (typo fixes)
+#   experiment
+#   balance
+#################################
+
+# Your name.  
+author: Arrow768
+
+# Optional: Remove this file after generating master changelog.  Useful for PR changelogs that won't get used again.
+delete-after: True
+
+# Any changes you've made.  See valid prefix list above.
+# INDENT WITH TWO SPACES.  NOT TABS.  SPACES.
+# SCREW THIS UP AND IT WON'T WORK.
+# Also, all entries are changed into a single [] after a master changelog generation. Just remove the brackets when you add new entries.
+# Please surround your changes in  double quotes ("), as certain characters otherwise screws up compiling. The quotes will not show up in the changelog.
+changes: 
+  - tweak: "By adding a secret additive to the food, NanoTrasen has increased the time it takes until food is burned in the cooking machines."