Minor changes and additions to comments

src/frontend/compiler/compiler.nim

@@ -651,7 +651,7 @@ method infer*(self: Compiler, node: Expression): Type  =
 method inferOrError*(self: Compiler, node: Expression): Type =
     ## Attempts to infer the type of
     ## the given expression and raises an 
-    ## error with if it fails
+    ## error if it fails
     result = self.infer(node)
     if result.isNil():
         self.error("expression has no type", node)

src/frontend/compiler/targets/bytecode/target.nim

@@ -1810,6 +1810,9 @@ proc varDecl(self: BytecodeCompiler, node: VarDecl) =
             # If this doesn't fail, then we're good
             typ = expected
         else:
+            # Let the compiler infer the type (this
+            # is the default behavior already, but
+            # some users may prefer to be explicit!)
             typ = self.infer(node.value)
     self.expression(node.value)
     self.emitByte(AddVar, node.token.line)