Replace 'async' in documents to 'async_'

Author: lambdalisue

README.md

@@ -76,9 +76,9 @@ below.
   computations. Intensive computations should be done in a separate thread (or
   process), and `vim.async_call` can be used to send results back to nvim.
 
-* Some methods accept an `async` keyword argument: `vim.eval`, `vim.command`,
+* Some methods accept an `async_` keyword argument: `vim.eval`, `vim.command`,
   `vim.request` as well as the `vim.funcs` and `vim.api` wrappers.  When
-  `async=True` is passed the client will not wait for nvim to complete the
+  `async_=True` is passed the client will not wait for nvim to complete the
   request (which also means that the return value is unavailable).
 
 #### Remote (new-style) plugins
@@ -122,7 +122,7 @@ requests without nvim confusing these requests with requests from a synchronous
 handler. To execute an asynchronous handler even when other handlers are
 running, add `allow_nested=True` to the decorator. The handler must then not
 make synchronous nvim requests, but it can make asynchronous requests, i e
-passing `async=True`.
+passing `async_=True`.
 
 You need to run `:UpdateRemotePlugins` in nvim for changes in the specifications
 to have effect. For details see `:help remote-plugin` in nvim.

docs/usage/python-plugin-api.rst

@@ -58,7 +58,7 @@ Note that this code will still block the plugin host if it does long-running com
 Intensive computations should be done in a separate thread (or process),
 and ``vim.async_call`` can be used to send results back to Neovim.
 
-Some methods accept an ``async`` keyword argument:
+Some methods accept an ``async_`` keyword argument:
 ``vim.eval``, ``vim.command``, ``vim.request`` as well as the ``vim.funcs`` and ``vim.api`` wrappers.
-When ``async=True`` is passed the client will not wait for Neovim to complete the request
+When ``async_=True`` is passed the client will not wait for Neovim to complete the request
 (which also means that the return value is unavailable).

docs/usage/remote-plugins.rst

@@ -42,7 +42,7 @@ This ensures that async handlers can call requests without Neovim confusing thes
 To execute an asynchronous handler even when other handlers are running,
 add ``allow_nested=True`` to the decorator.
 The handler must then not make synchronous Neovim requests,
-but it can make asynchronous requests, i.e. passing ``async=True``.
+but it can make asynchronous requests, i.e. passing ``async_=True``.
 
 You need to run ``:UpdateRemotePlugins`` in Neovim for changes in the specifications to have effect.
 For details see ``:help remote-plugin`` in Neovim.