docs: fix some typos

the `congestion` typo has been mentioned in the forum:
https://forum.proxmox.com/threads/proxmox-backup-server-2-1-released.100240/#post-443370

fixed a few surrounding ones and ones that `codespell` found in
addition to that.

Signed-off-by: Thomas Lamprecht <t.lamprecht@proxmox.com>

docs/backup-client.rst

@@ -71,7 +71,7 @@ Environment Variables
 
 
 .. Note:: Passwords must be valid UTF-8 and may not contain newlines. For your
-   convienience, Proxmox Backup Server only uses the first line as password, so
+   convenience, Proxmox Backup Server only uses the first line as password, so
    you can add arbitrary comments after the first newline.
 
 

docs/managing-remotes.rst

@@ -117,9 +117,9 @@ The same filter is applied to local groups for handling of the
 Bandwidth Limit
 ^^^^^^^^^^^^^^^
 
-Syncing datastores to an archive can produce lots of traffic and impact other
-users of the network. So, to avoid network or storage congetsion you can limit
-the bandwith of the sync job by setting the ``rate-in`` option either in the
+Syncing a datastore to an archive can produce lots of traffic and impact other
+users of the network. So, to avoid network or storage congestion you can limit
+the bandwidth of the sync job by setting the ``rate-in`` option either in the
 web interface or using the ``proxmox-backup-manager`` command-line tool:
 
 .. code-block:: console

docs/traffic-control.rst

@@ -21,7 +21,7 @@ You can manage the traffic controls either over the web-interface or using the
 tool.
 
 .. note:: Sync jobs on the server are not affected by its rate-in limits. If
-   you want to limit the incomming traffic that a pull-based sync job
+   you want to limit the incoming traffic that a pull-based sync job
    generates, you need to setup a job-specific rate-in limit. See
    :ref:`syncjobs`.