Fix typo

docs/book/validation.ipynb

@@ -6,7 +6,7 @@
    "source": [
     "# Validation\n",
     "\n",
-    "We primarily validate tax model input datasets by comparing against the IRS Survey of Incomes data releases. For each data year, we have access to between 1,000 and 2,000 individual statistical targets (e.g. \"total taxable Social Security for filers with AGI between 30k and 40k\"). For each dataset produced by this repo, we can attempt to reproduce these statistics.\n",
+    "We primarily validate tax model input datasets by comparing against the IRS Statistics of Incomes data releases. For each data year, we have access to between 1,000 and 2,000 individual statistical targets (e.g. \"total taxable Social Security for filers with AGI between 30k and 40k\"). For each dataset produced by this repo, we can attempt to reproduce these statistics.\n",
     "\n",
     "There are valid reasons why datasets might not be able to reproduce SOI statistics:\n",
     "\n",
@@ -1880,7 +1880,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.9.18"
+   "version": "3.9.19"
   }
  },
  "nbformat": 4,