add slim_ptr docs

Author: 9il

doc/Makefile

@@ -51,7 +51,7 @@ PACKAGE_mir_interpolate = package constant linear spline utility polynomial
 PACKAGE_mir_math = sum numeric stat
 PACKAGE_mir_math_func = expdigamma
 PACKAGE_mir_ndslice_connect = cpython
-PACKAGE_mir_rc = package ptr array context
+PACKAGE_mir_rc = package ptr array context slim_ptr
 
 PACKAGE_mir_ndslice = \
 	allocation\

index.d

@@ -24,7 +24,8 @@ $(BOOKTABLE ,
     $(TR $(TDNW $(MREF mir,polynomial)) $(TD Polynomial ref-counted structure))
     $(LEADINGROW Reference counting)
     $(TR $(TDNW $(MREF mir,rc,array)) $(TD Thread safe reference count array and the iterator to adopt it to ndslice.))
-    $(TR $(TDNW $(MREF mir,rc,ptr)) $(TD Thread safe reference count pointer for strucs and objects.))
+    $(TR $(TDNW $(MREF mir,rc,ptr)) $(TD Thread safe reference count pointer with polymorphism support for strucs and objects.))
+    $(TR $(TDNW $(MREF mir,rc,slim_ptr)) $(TD Thread safe reference count pointer for strucs and objects.))
     $(LEADINGROW Containers)
     $(TR $(TDNW $(MREF mir,series)★) $(TD Generic series suitable for time-series or semi-immutable ordered maps with CPU cache friendly binary search.))
     $(TR $(TDNW $(MREF mir,container,binaryheap)★) $(TD Mir & BetterC rework of Phobos.))