Merge pull request #878 from fensch/patch-1

Update Typo in blocks.qmd

Author: WardBrian

src/reference-manual/blocks.qmd

@@ -296,7 +296,7 @@ supplied to the program at run time, they must be declared in the
 `data` block, like the variables `mu_mu` and
 `sigma_mu`.
 
-This program declares two modeled parameters, `mu` and
+This program declares two modeled parameters, `mu_y` and
 `tau_y`.  These are the location and precision used in the normal
 model of the values in `y`.  The heart of the model will be
 sampling the values of these parameters from their posterior