bash man page lacks mention of case flipping

[l]

Configuration Information [Automatically generated, do not change]:
Machine: x86_64
OS: linux-gnu
Compiler: gcc
Compilation CFLAGS: -g -O2 -fdebug-prefix-map=/build/bash-2bxm7h/bash-5.0=. 
-fstack-protector-strong -Wformat -Werror=format-security -Wall 
-Wno-parentheses -Wno-format-security
uname output: Linux latitude 4.19.0-5-amd64 #1 SMP Debian 4.19.37-5 
(2019-06-19) x86_64 GNU/Linux
Machine Type: x86_64-pc-linux-gnu

Bash Version: 5.0
Patch Level: 3
Release Status: release

Description:
        manual page of bash has (still) no mention of case flipping ( ${var~} 
and ${var~~}.

Repeat-By:
        man bash


Fix:
        Add descriptions to Case modification section:
          ${parameter~pattern}
          ${parameter~~pattern}