Fix cross links

Author: troyraen

tutorials/spherex/spherex_cutouts.md

@@ -11,6 +11,7 @@ kernelspec:
   name: python3
 ---
 
+(spherex-cutouts)=
 # Download a collection of SPHEREx Spectral Image cutouts as a multi-extension FITS file
 
 ## 1. Learning Goals

tutorials/spherex/spherex_intro.md

@@ -12,6 +12,7 @@ kernelspec:
   name: python3
 ---
 
+(spherex-intro)=
 # Introduction to SPHEREx Spectral Images
 
 +++

tutorials/spherex/spherex_psf.md

@@ -70,7 +70,7 @@ Both should be defined using `astropy` units.
 The goal is to obtain the cutout and then extract the PSF corresponding to the coordinates of interest.
 
 ```{tip}
-To learn more about how to access SPHEREx spectral images and how to download cutouts, we refer to the [SPHEREx Intro Tutorial](https://caltech-ipac.github.io/irsa-tutorials/tutorials/spherex/spherex_intro.html1) and the [SPHEREx Cutout Tutorial](https://caltech-ipac.github.io/irsa-tutorials/1).
+To learn more about how to access SPHEREx spectral images and how to download cutouts, we refer to the [SPHEREx Intro Tutorial](spherex-intro) and the [SPHEREx Cutouts Tutorial](spherex-cutouts).
 ```
 
 ```{code-cell} ipython3