doc: update README.md

Author: tyru

README.md

@@ -62,7 +62,7 @@ See [the command reference](https://github.com/vim-volt/volt/blob/master/CMDREF.
 * Or `go get github.com/vim-volt/volt`
   * You need Go 1.9 or higher
   * And if you are using Windows Subsystem Linux, you need to apply **[the patch for os.RemoveAll()](https://go-review.googlesource.com/c/go/+/62970) ! ([#1](https://github.com/vim-volt/go-volt/issues/1))**
-  * But it's a hassle, you can just download linux-386/amd64 binaries from [GitHub releases](https://github.com/vim-volt/volt/releases) :)
+  * But it's a hassle, you can just download linux-(386/amd64) binaries from [GitHub releases](https://github.com/vim-volt/volt/releases) :)
 
 And there is bash completion script in [\_contrib](https://github.com/vim-volt/volt/blob/master/_contrib/completion/bash) directory (thanks @AvianY).
 
@@ -119,12 +119,10 @@ You can update all plugins as follows:
 $ volt get -l -u
 ```
 
-`-l` works like all plugins in current profile are specified (the repositories list is read from `$VOLTPATH/lock.json`).
-If you do not use profile feature, or `enable` and `disable` commands, you can
-think that `-l` specifies all plugins what you have installed.
 `-u` updates specified plugins.
+`-l` works like all plugins in current profile are specified (the repositories list is read from `$VOLTPATH/lock.json`).
 
-Or, update only specified plugin(s) as follows:
+Or you can update only specified plugin(s) as follows:
 
 ```
 $ volt get -u tyru/caw.vim