Update the docs for tree to include new format option.

Author: nebkor

src/doc/man/cargo-tree.md

@@ -145,6 +145,7 @@ strings will be replaced with the corresponding value:
 - `{l}` — The package license.
 - `{r}` — The package repository URL.
 - `{f}` — Comma-separated list of package features that are enabled.
+- `{lib}` — The name of the package's library.
 {{/option}}
 
 {{#option "`--prefix` _prefix_" }}

src/doc/man/generated_txt/cargo-tree.txt

@@ -138,6 +138,8 @@ OPTIONS
            o  {f} — Comma-separated list of package features that are
               enabled.
 
+           o  {lib} — The name of the package's library.
+
        --prefix prefix
            Sets how each line is displayed. The prefix value can be one of:
 

src/doc/src/commands/cargo-tree.md

@@ -145,6 +145,7 @@ strings will be replaced with the corresponding value:</p>
 <li><code>{l}</code> — The package license.</li>
 <li><code>{r}</code> — The package repository URL.</li>
 <li><code>{f}</code> — Comma-separated list of package features that are enabled.</li>
+<li><code>{lib}</code> — The name of the package's library.</li>
 </ul></dd>
 
 

src/etc/man/cargo-tree.1

@@ -186,6 +186,10 @@ strings will be replaced with the corresponding value:
 .RS 4
 \h'-04'\(bu\h'+02'\fB{f}\fR \[em] Comma\-separated list of package features that are enabled.
 .RE
+.sp
+.RS 4
+\h'-04'\(bu\h'+02'\fB{lib}\fR \[em] The name of the package's library.
+.RE
 .RE
 .sp
 \fB\-\-prefix\fR \fIprefix\fR