Fix html table rendering in type promotion doc

spec/API_specification/type_promotion.md

@@ -18,59 +18,59 @@ In code, use the data type objects specified in {ref}`data-types` (e.g., `int16`
 
 <!-- Note: please keep table columns aligned -->
 
--   signed integer type promotion table:
+### Signed integer type promotion table
 
-    |        | i1 | i2 | i4 | i8 |
-    | ------ | -- | -- | -- | -- |
-    | **i1** | i1 | i2 | i4 | i8 |
-    | **i2** | i2 | i2 | i4 | i8 |
-    | **i4** | i4 | i4 | i4 | i8 |
-    | **i8** | i8 | i8 | i8 | i8 |
+|        | i1 | i2 | i4 | i8 |
+| ------ | -- | -- | -- | -- |
+| **i1** | i1 | i2 | i4 | i8 |
+| **i2** | i2 | i2 | i4 | i8 |
+| **i4** | i4 | i4 | i4 | i8 |
+| **i8** | i8 | i8 | i8 | i8 |
 
-    where
+where
 
-    -   **i1**: 8-bit signed integer (i.e., `int8`)
-    -   **i2**: 16-bit signed integer (i.e., `int16`)
-    -   **i4**: 32-bit signed integer (i.e., `int32`)
-    -   **i8**: 64-bit signed integer (i.e., `int64`)
+-   **i1**: 8-bit signed integer (i.e., `int8`)
+-   **i2**: 16-bit signed integer (i.e., `int16`)
+-   **i4**: 32-bit signed integer (i.e., `int32`)
+-   **i8**: 64-bit signed integer (i.e., `int64`)
 
--   unsigned integer type promotion table:
+### Unsigned integer type promotion table
 
-    |        | u1 | u2 | u4 | u8 |
-    | ------ | -- | -- | -- | -- |
-    | **u1** | u1 | u2 | u4 | u8 |
-    | **u2** | u2 | u2 | u4 | u8 |
-    | **u4** | u4 | u4 | u4 | u8 |
-    | **u8** | u8 | u8 | u8 | u8 |
+|        | u1 | u2 | u4 | u8 |
+| ------ | -- | -- | -- | -- |
+| **u1** | u1 | u2 | u4 | u8 |
+| **u2** | u2 | u2 | u4 | u8 |
+| **u4** | u4 | u4 | u4 | u8 |
+| **u8** | u8 | u8 | u8 | u8 |
 
-    where
+where
 
-    -   **u1**: 8-bit unsigned integer (i.e., `uint8`)
-    -   **u2**: 16-bit unsigned integer (i.e., `uint16`)
-    -   **u4**: 32-bit unsigned integer (i.e., `uint32`)
-    -   **u8**: 64-bit unsigned integer (i.e., `uint64`)
+-   **u1**: 8-bit unsigned integer (i.e., `uint8`)
+-   **u2**: 16-bit unsigned integer (i.e., `uint16`)
+-   **u4**: 32-bit unsigned integer (i.e., `uint32`)
+-   **u8**: 64-bit unsigned integer (i.e., `uint64`)
 
--   mixed unsigned and signed integer type promotion table:
+### Mixed unsigned and signed integer type promotion table
 
-    |        | u1 | u2 | u4 |
-    | ------ | -- | -- | -- |
-    | **i1** | i2 | i4 | i8 |
-    | **i2** | i2 | i4 | i8 |
-    | **i4** | i4 | i4 | i8 |
+|        | u1 | u2 | u4 |
+| ------ | -- | -- | -- |
+| **i1** | i2 | i4 | i8 |
+| **i2** | i2 | i4 | i8 |
+| **i4** | i4 | i4 | i8 |
 
--   floating-point type promotion table:
+### Floating-point type promotion table
 
-    |        | f4 | f8 |
-    | ------ | -- | -- |
-    | **f4** | f4 | f8 |
-    | **f8** | f8 | f8 |
+|        | f4 | f8 |
+| ------ | -- | -- |
+| **f4** | f4 | f8 |
+| **f8** | f8 | f8 |
 
-    where
+where
 
-    -   **f4**: single-precision (32-bit) floating-point number (i.e., `float32`)
-    -   **f8**: double-precision (64-bit) floating-point number (i.e., `float64`)
+-   **f4**: single-precision (32-bit) floating-point number (i.e., `float32`)
+-   **f8**: double-precision (64-bit) floating-point number (i.e., `float64`)
 
-## Notes
+### Notes
 
 -   Type promotion rules **strictly** apply when determining the common result type for two **array** operands during an arithmetic operation, regardless of array dimension. Accordingly, zero-dimensional arrays are subject to the same type promotion rules as dimensional arrays.
 -   Type promotion of non-numerical data types to numerical data types is unspecified (e.g., `bool` to `intxx` or `floatxx`).