Auto merge of #11774 - pea-sys:update-cargo-add-doc, r=weihanglo

Addition of support for -F as an alias for --features

Updated documentation for #10576

Author: bors

Diff for: src/doc/man/cargo-add.md

@@ -1,4 +1,5 @@
 # cargo-add(1)
+
 {{*set actionverb="Add"}}
 {{*set nouns="adds"}}
 
@@ -115,7 +116,7 @@ Disable the [default features](../reference/features.html#dependency-features).
 Re-enable the [default features](../reference/features.html#dependency-features).
 {{/option}}
 
-{{#option "`--features` _features_" }}
+{{#option "`-F` _features_" "`--features` _features_" }}
 Space or comma separated list of [features to
 activate](../reference/features.html#dependency-features). When adding multiple
 crates, the features for a specific crate may be enabled with

Diff for: src/doc/man/generated_txt/cargo-add.txt

@@ -103,7 +103,7 @@ OPTIONS
            Re-enable the default features
            <https://doc.rust-lang.org/cargo/reference/features.html#dependency-features>.
 
-       --features features
+       -F features, --features features
            Space or comma separated list of features to activate
            <https://doc.rust-lang.org/cargo/reference/features.html#dependency-features>.
            When adding multiple crates, the features for a specific crate may

Diff for: src/doc/src/commands/cargo-add.md

@@ -2,6 +2,7 @@
 
 
 
+
 ## NAME
 
 cargo-add --- Add dependencies to a Cargo.toml manifest file
@@ -121,6 +122,7 @@ which is defined by the <code>registry.default</code> config key which defaults
 <dd class="option-desc">Re-enable the <a href="../reference/features.html#dependency-features">default features</a>.</dd>
 
 
+<dt class="option-term" id="option-cargo-add--F"><a class="option-anchor" href="#option-cargo-add--F"></a><code>-F</code> <em>features</em></dt>
 <dt class="option-term" id="option-cargo-add---features"><a class="option-anchor" href="#option-cargo-add---features"></a><code>--features</code> <em>features</em></dt>
 <dd class="option-desc">Space or comma separated list of <a href="../reference/features.html#dependency-features">features to
 activate</a>. When adding multiple

Diff for: src/etc/man/cargo-add.1

@@ -130,6 +130,7 @@ Disable the \fIdefault features\fR <https://doc.rust\-lang.org/cargo/reference/f
 Re\-enable the \fIdefault features\fR <https://doc.rust\-lang.org/cargo/reference/features.html#dependency\-features>\&.
 .RE
 .sp
+\fB\-F\fR \fIfeatures\fR, 
 \fB\-\-features\fR \fIfeatures\fR
 .RS 4
 Space or comma separated list of \fIfeatures to