doc: update IR samples to new mie sub-directory and file extension

doc/mie/sample/Person.mie

@@ -0,0 +1,39 @@
+record package_scope = "net.doorstuck.test"
+
+record import = { "std.io" }
+
+define void @L0001(id %0) lambda {
+
+}
+
+define void @Person::@_M4init4name3ageE(id %0, id %1) instance {
+
+}
+
+define void @Person::@_M4test5param0E(id %0, id %1) instance {
+
+}
+
+define id @Person::@_M4nameE(id %0, id %1) instance {
+
+}
+
+define id @Person::@_M3ageE(id %0, id %1) instance {
+
+}
+
+define id @Person::@_M11ageInMonthsE(id %0, id %1) instance {
+
+}
+
+define void @Person::@_M07setNameE(id %0, id %1) instance {
+
+}
+
+define void @Person::@_M06setAge6inUnitE(id %0, id %1) instance {
+
+}
+
+define id @Person::@_M012getAgeInUnitE(id %0, id %1) instance {
+
+}