docs: add {get,set}payloadbf16 and setpayloadsigbf16 math functions

Signed-off-by: Krishna Pandey <[email protected]>

Author: krishna2803

libc/docs/headers/math/index.rst

@@ -187,7 +187,7 @@ Basic Operations
 +------------------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+------------------------+----------------------------+
 | fsub             | N/A              | |check|         | |check|                | N/A                  | |check|\*              | N/A                    | 7.12.14.2              | F.10.11                    |
 +------------------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+------------------------+----------------------------+
-| getpayload       | |check|          | |check|         | |check|                | |check|              | |check|                |                        | F.10.13.1              | N/A                        |
+| getpayload       | |check|          | |check|         | |check|                | |check|              | |check|                | |check|                | F.10.13.1              | N/A                        |
 +------------------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+------------------------+----------------------------+
 | ilogb            | |check|          | |check|         | |check|                | |check|              | |check|                |                        | 7.12.6.8               | F.10.3.8                   |
 +------------------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+------------------------+----------------------------+
@@ -237,9 +237,9 @@ Basic Operations
 +------------------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+------------------------+----------------------------+
 | scalbn           | |check|          | |check|         | |check|                | |check|              | |check|                |                        | 7.12.6.19              | F.10.3.19                  |
 +------------------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+------------------------+----------------------------+
-| setpayload       | |check|          | |check|         | |check|                | |check|              | |check|                |                        | F.10.13.2              | N/A                        |
+| setpayload       | |check|          | |check|         | |check|                | |check|              | |check|                | |check|                | F.10.13.2              | N/A                        |
 +------------------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+------------------------+----------------------------+
-| setpayloadsig    | |check|          | |check|         | |check|                | |check|              | |check|                |                        | F.10.13.3              | N/A                        |
+| setpayloadsig    | |check|          | |check|         | |check|                | |check|              | |check|                | |check|                | F.10.13.3              | N/A                        |
 +------------------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+------------------------+----------------------------+
 | totalorder       | |check|          | |check|         | |check|                | |check|              | |check|                |                        | F.10.12.1              | N/A                        |
 +------------------+------------------+-----------------+------------------------+----------------------+------------------------+------------------------+------------------------+----------------------------+