rsz: restore "Legalize the buffer position" comment

Lost in the fold-into-postProcess refactor; restore it above each
insertBufferPostProcess() call site for readability.

Signed-off-by: minjukim55 <mkim@precisioninno.com>

Author: minjukim55

src/rsz/src/Resizer.cc

@@ -4906,6 +4906,7 @@ odb::dbInst* Resizer::insertBufferAfterDriver(
     return nullptr;
   }
 
+  // Legalize the buffer position and update the design area
   insertBufferPostProcess(buffer_inst, loc);
 
   return buffer_inst;
@@ -4995,6 +4996,7 @@ odb::dbInst* Resizer::insertBufferBeforeLoad(
     return nullptr;
   }
 
+  // Legalize the buffer position and update the design area
   insertBufferPostProcess(buffer_inst, loc);
 
   return buffer_inst;
@@ -5117,6 +5119,7 @@ odb::dbInst* Resizer::insertBufferBeforeLoads(
     return nullptr;
   }
 
+  // Legalize the buffer position and update the design area
   insertBufferPostProcess(buffer_inst, loc);
 
   return buffer_inst;