README: Fix typos.

Author: alexmv

README.md

@@ -126,7 +126,7 @@ discussion in the main [Zulip installation docs][install-normal]):
 - `SETTING_ZULIP_ADMINISTRATOR`: The email address to receive error
   and support emails generated by the Zulip server and its users.
 
-**Mandatory settings for produciton use**. Before you allow production
+**Mandatory settings for production use**. Before you allow production
 traffic, you need to generate secrets. We recommend using long random
 strings of alphanumeric characters for your secrets; not every special
 character works.
@@ -363,7 +363,7 @@ https://chat.zulip.org/#narrow/stream/21-provision-help/subject/K8.20and.20Helm/
 This image is not designed to make it easy to run multiple copies of
 the `zulip` application server container (and you need to know a lot
 about Zulip to do this sort of thing successfully). If you're
-interested in running a high-availablity Zulip installation, your best
+interested in running a high-availability Zulip installation, your best
 bet is to get in touch with the Zulip team at `[email protected]`.
 
 ## Networking and reverse proxy configuration