Minor edits

Author: turukawa

Lesson 2-1 - Validating restructured data against a schema using a spreadsheet.ipynb

@@ -256,7 +256,7 @@
     "The process is straightforward:\n",
     "\n",
     "1. Select the cells in a specific column you wish to limit by type\n",
-    "2. Select __Data > Data Validation__.\n",
+    "2. Select __Data > Data Tools > Data Validation__.\n",
     "\n",
     "  ![Excel data validation](images/excel-data-validation.png)\n",
     "\n",
@@ -293,14 +293,14 @@
     "\n",
     "Before you can validate a `list` type, you need to specify valid terms. In Excel, this requires an [extra set of steps](https://support.office.com/en-us/article/create-a-drop-down-list-7693307a-59ef-400a-b769-c5402dce407b).\n",
     "\n",
-    "1. Create a new worksheet in Excel, and there list the terms you want to set as valid values. You can quickly convert your list to a table by selecting any cell in the range, and pressing __Ctrl+T__.\n",
+    "1. Create a new worksheet in Excel, and there list the terms you want to set as valid values. You can quickly convert your list to a table by selecting any cell in the range, and pressing __Ctrl+T__ (this may differ from version to version in Excel, or entirely in Open Office or other spreadsheet applications).\n",
     "\n",
     "  ![List terms](images/excel-list-terms.png)\n",
     "  \n",
     "2. Add your list data and format it as a Table (__Home tab > Styles > Format as Table__).\n",
     "3. You can name your table from the Table tools tab - this one could be named \"CityTable\".  This will help you keep track of multiple tables.\n",
     "4. In the validation process listed above, go to 3. and select __List__, then add a named range or table name for your list. \n",
-    "5. Specify a source for your terms via __Data tab > Data Validation > Allow List > Source >__. Then specify your list of terms as any of:\n",
+    "5. Specify a source for your terms via __Data tab > Data Validation > Allow List > Source__. Then specify your list of terms as any of:\n",
     "\n",
     "  ![List source](images/excel-list-source.png)\n",
     "\n",