[PATCH 2/2] man: Update man page to use bold where appropriate

[David Vernet <void@manifault.com>]

According to https://man7.org/linux/man-pages/man1/man.1.html, when writing
a man page for a program, anything that should be typed exactly as shown
should use bolded text. The b4 man page has a SUBCOMMANDS section where
subcommands are listed as 'b4 <subcommand>', in italics. So as to match the
guidance for man pages (as well as to match the examples provided at the
link above), this diff updates the 'b4' portion of the aforementioned
subcommand section to be bolded.

Signed-off-by: David Vernet <void@manifault.com>
---
 man/b4.5.rst | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/man/b4.5.rst b/man/b4.5.rst
index ab12804..b45909a 100644
--- a/man/b4.5.rst
+++ b/man/b4.5.rst
@@ -27,14 +27,14 @@ precursor to Lore and Data in the Star Trek universe.
 
 SUBCOMMANDS
 -----------
-* *b4 mbox*: Download a thread as an mbox file
-* *b4 am*: Create an mbox file that is ready to git-am
-* *b4 shazam*: Similar to *am*, but lets you apply patches directly
-* *b4 pr*: Work with pull requests
-* *b4 diff*: Show range-diff style diffs between patch versions
-* *b4 ty*: Create templated replies for processed patches and pull requests
-* *b4 attest*: (EXPERIMENTAL) Add cryptographic attestation to patches
-* *b4 kr* (EXPERIMENTAL) Operate on patatt-compatible keyrings
+* **b4** *mbox*: Download a thread as an mbox file
+* **b4** *am*: Create an mbox file that is ready to git-am
+* **b4** *shazam*: Similar to *am*, but lets you apply patches directly
+* **b4** *pr*: Work with pull requests
+* **b4** *diff*: Show range-diff style diffs between patch versions
+* **b4** *ty*: Create templated replies for processed patches and pull requests
+* **b4** *attest*: (EXPERIMENTAL) Add cryptographic attestation to patches
+* **b4** *kr* (EXPERIMENTAL) Operate on patatt-compatible keyrings
 
 OPTIONS
 -------
-- 
2.30.2