replace 1-10 checkboxes to tidy up appearance

.github/ISSUE_TEMPLATE.md

@@ -6,16 +6,7 @@
 
 **How familiar are you with the codebase?:**
 
-- [] 1 (very unfamiliar)
-- [] 2
-- [] 3
-- [] 4
-- [] 5
-- [] 6
-- [] 7
-- [] 8
-- [] 9
-- [] 10 (very familiar)
+_{replace this text with a number from 1 to 10, with 1 being not familiar, and 10 being very familiar}_
 
 ---
 **[FEATURE REQUEST | QUESTION | OTHER]:**

.github/PULL_REQUEST_TEMPLATE.md

@@ -10,16 +10,7 @@
 
 **How familiar are you with the codebase?:**
 
-- [] 1 (very unfamiliar)
-- [] 2
-- [] 3
-- [] 4
-- [] 5
-- [] 6
-- [] 7
-- [] 8
-- [] 9
-- [] 10 (very familiar)
+_{replace this text with a number from 1 to 10, with 1 being not familiar, and 10 being very familiar}_
 
 ---
 _{replace this line with your pull request content}_