Merge pull request #20346 from Homebrew/sponsors-maintainers-man-completions

Update manpage and completions.

Author: ZhongRuoyu

docs/Manpage.md

@@ -3571,6 +3571,10 @@ and Linux workers.
 
 : Clean all state from the Homebrew directory. Use with care!
 
+`--concurrent-downloads`
+
+: Invoke `brew` with `HOMEBREW_DOWNLOAD_CONCURRENCY=auto`.
+
 `--skip-setup`
 
 : Don't check if the local system is set up correctly.

manpages/brew.1

@@ -1,5 +1,5 @@
 .\" generated by kramdown
-.TH "BREW" "1" "July 2025" "Homebrew"
+.TH "BREW" "1" "August 2025" "Homebrew"
 .SH NAME
 brew \- The Missing Package Manager for macOS (or Linux)
 .SH "SYNOPSIS"
@@ -2275,6 +2275,9 @@ Print what would be done rather than doing it\.
 \fB\-\-cleanup\fP
 Clean all state from the Homebrew directory\. Use with care!
 .TP
+\fB\-\-concurrent\-downloads\fP
+Invoke \fBbrew\fP with \fBHOMEBREW_DOWNLOAD_CONCURRENCY=auto\fP\&\.
+.TP
 \fB\-\-skip\-setup\fP
 Don\[u2019]t check if the local system is set up correctly\.
 .TP