GameDB: Add comment for Mipmapping on P3 FES

Adds a comment to the game fix on P3 Fes to mention the flashing windows it fixes.

bin/resources/GameIndex.yaml

@@ -5208,7 +5208,7 @@ SCKA-20109:
   name: "Persona 3 FES [Independent Starting Version]"
   region: "NTSC-K"
   gsHWFixes:
-    mipmap: 1
+    mipmap: 2 # Fixes flashing windows.
   memcardFilters:
     - "SCKA-20109"
     - "SCKA-20099"
@@ -21658,7 +21658,7 @@ SLES-55354:
   name: "Shin Megami Tensei - Persona 3 FES"
   region: "PAL-E"
   gsHWFixes:
-    mipmap: 1
+    mipmap: 2 # Fixes flashing windows.
   memcardFilters:
     - "SLES-55354"
     - "SLES-55018"
@@ -32735,7 +32735,7 @@ SLPM-66689:
   name: "Persona 3 FES [Append Edition]"
   region: "NTSC-J"
   gsHWFixes:
-    mipmap: 1
+    mipmap: 2 # Fixes flashing windows.
   memcardFilters:
     - "SLPM-66445"
     - "SLPM-66689"
@@ -32744,7 +32744,7 @@ SLPM-66690:
   name: "Persona 3 FES [Independent Starting Version]"
   region: "NTSC-J"
   gsHWFixes:
-    mipmap: 1
+    mipmap: 2 # Fixes flashing windows.
   memcardFilters:
     - "SLPM-66445"
     - "SLPM-66689"
@@ -34312,7 +34312,7 @@ SLPM-74277:
   region: "NTSC-J"
   compat: 5
   gsHWFixes:
-    mipmap: 1
+    mipmap: 2 # Fixes flashing windows.
 SLPM-74278:
   name: "Persona 4 [PlayStation 2 The Best]"
   region: "NTSC-J"
@@ -47374,7 +47374,7 @@ SLUS-21621:
   region: "NTSC-U"
   compat: 5
   gsHWFixes:
-    mipmap: 1
+    mipmap: 2 # Fixes flashing windows.
   memcardFilters:
     - "SLUS-21621"
     - "SLUS-21569"
@@ -49004,7 +49004,7 @@ SLUS-28068:
   name: "Shin Megami Tensei - Persona 3 FES [Trade Demo]"
   region: "NTSC-U"
   gsHWFixes:
-    mipmap: 1
+    mipmap: 2 # Fixes flashing windows.
 SLUS-28069:
   name: "Shin Megami Tensei - Persona 4 [Trade Demo]"
   region: "NTSC-U"