Doc tweaks

Author: neilconway

docs/source/library-user-guide/upgrading/53.0.0.md

@@ -457,17 +457,16 @@ contexts (`=`, `<`, `>`, `<=`, `>=`, `<>`, `IN`, `BETWEEN`, `CASE .. WHEN`).
 - Queries that use `IN` lists with mixed string and numeric types
 - Queries that use `CASE expr WHEN` with mixed string and numeric types
 
-**Behavioral changes (old → new):**
-
-| Expression                  | Old behavior                      | New behavior                               |
-| --------------------------- | --------------------------------- | ------------------------------------------ |
-| `int_col > '100'`           | Lexicographic (incorrect)         | Numeric (correct)                          |
-| `float_col = '5'`           | String `'5' != '5.0'` (incorrect) | Numeric `5.0 = 5.0` (correct)              |
-| `int_col = 'hello'`         | String comparison, always false   | Cast error                                 |
-| `str_col IN ('a', 1)`       | Coerce to Utf8                    | Cast error (`'a'` cannot be cast to Int64) |
-| `float_col IN ('1.0')`      | String `'1.0' != '1'` (incorrect) | Numeric `1.0 = 1.0` (correct)              |
-| `CASE str_col WHEN 1.0`     | Coerce to Utf8                    | Coerce to Float64                          |
-| `SELECT 1 UNION SELECT 'a'` | Coerce to Utf8                    | Coerce to Utf8 (unchanged)                 |
+**Behavioral changes:**
+
+| Expression              | Old behavior                    | New behavior                               |
+| ----------------------- | ------------------------------- | ------------------------------------------ |
+| `int_col > '100'`       | Lexicographic                   | Numeric                                    |
+| `float_col = '5'`       | String `'5' != '5.0'`           | Numeric `5.0 = 5.0`                        |
+| `int_col = 'hello'`     | String comparison, always false | Cast error                                 |
+| `str_col IN ('a', 1)`   | Coerce to Utf8                  | Cast error (`'a'` cannot be cast to Int64) |
+| `float_col IN ('1.0')`  | String `'1.0' != '1'`           | Numeric `1.0 = 1.0` (correct)              |
+| `CASE str_col WHEN 1.0` | Coerce to Utf8                  | Coerce to Float64                          |
 
 **Migration guide:**
 
@@ -480,7 +479,7 @@ adjustment:
   non-numeric values) will now produce a cast error instead of silently
   returning no rows.
 - **Mixed-type `IN` lists** (e.g., `str_col IN ('a', 1)`) are now rejected. Use
-  consistent types in the list, or add an explicit `CAST`.
+  consistent types for the `IN` list or add an explicit `CAST`.
 - **Queries comparing integer columns with decimal strings** (e.g.,
   `int_col = '99.99'`) will now produce a cast error because `'99.99'`
   cannot be cast to an integer. Use a float column or adjust the literal.