Fix links in hints for Project 4

Author: kcpearce

Project#04/hints/hint1.md

@@ -1,4 +1,4 @@
-Here's a code block that demonstrates how to carry out the AO to MO two-electron integral transformation using a single N<sup>8</sup> step.  Note that the original AO- and transformed MO-basis integrals are stored in a one-dimensional array taking full advantage of their eight-fold permutational symmetry, as described in [Project #3](../Project%2303).
+Here's a code block that demonstrates how to carry out the AO to MO two-electron integral transformation using a single N<sup>8</sup> step.  Note that the original AO- and transformed MO-basis integrals are stored in a one-dimensional array taking full advantage of their eight-fold permutational symmetry, as described in [Project #3](../../Project%2303).
 
 Note how the loop structure in the MO-indices (*i*, *j*, *k*, and *l*) automatically takes into account the permutational symmetry of the fully transformed integrals.
 

Project#04/hints/hint2.md

@@ -1,4 +1,4 @@
-Here's a code block that demonstrates how to carry out the AO to MO two-electron integral transformation using four N<sup>5</sup> steps.  Note that the original AO- and transformed MO-basis integrals are stored in a one-dimensional array taking advantage of their eight-fold permutational symmetry, as described in [Project #3](../Project%2303).  However, the half-transformed integrals, which lack bra-ket permutational symmetry, are stored in a two-dimensional array.
+Here's a code block that demonstrates how to carry out the AO to MO two-electron integral transformation using four N<sup>5</sup> steps.  Note that the original AO- and transformed MO-basis integrals are stored in a one-dimensional array taking advantage of their eight-fold permutational symmetry, as described in [Project #3](../../Project%2303).  However, the half-transformed integrals, which lack bra-ket permutational symmetry, are stored in a two-dimensional array.
 
 A number of convenient functions [`mmult()`, `init_matrix()`, etc.] used in this code block can be found in the [diag.cc](http://sirius.chem.vt.edu/~crawdad/programming/diag.cc) discussed in [Project #1](../Project%2301).