doc: update docs and fixed typos (#5821)

Author: agile6v

docs/development.md

@@ -101,7 +101,7 @@ $ TAG=<tag> REGISTRY=$USER/ingress-controller make image
 ## Deploying
 
 There are several ways to deploy the ingress controller onto a cluster.
-Please check the [deployment guide](./deploy/)
+Please check the [deployment guide](./deploy/index.md)
 
 ## Testing
 

docs/user-guide/nginx-configuration/configmap.md

@@ -19,7 +19,7 @@ data:
     This means that we want a value with boolean values we need to quote the values, like "true" or "false".
     Same for numbers, like "100".
 
-    "Slice" types (defined below as `[]string` or `[]int` can be provided as a comma-delimited string.
+    "Slice" types (defined below as `[]string` or `[]int`) can be provided as a comma-delimited string.
 
 ## Configuration options
 
@@ -444,7 +444,7 @@ Sets the bucket size for the [map variables hash tables](http://nginx.org/en/doc
 
 ## proxy-real-ip-cidr
 
-If use-proxy-protocol is enabled, proxy-real-ip-cidr defines the default the IP/network address of your external load balancer.
+If use-forwarded-headers or use-proxy-protocol is enabled, proxy-real-ip-cidr defines the default the IP/network address of your external load balancer.
 
 ## proxy-set-headers
 
@@ -508,6 +508,8 @@ The ordering of a ciphersuite is very important because it decides which algorit
 
 Please check the [Mozilla SSL Configuration Generator](https://mozilla.github.io/server-side-tls/ssl-config-generator/).
 
+__Note:__ ssl_prefer_server_ciphers directive will be enabled by default for http context.
+
 ## ssl-ecdh-curve
 
 Specifies a curve for ECDHE ciphers.

rootfs/etc/nginx/lua/certificate.lua

@@ -57,14 +57,14 @@ local function get_pem_cert_uid(raw_hostname)
     return uid
   end
 
-  local wildcard_hosatname, _, err = re_sub(hostname, "^[^\\.]+\\.", "*.", "jo")
+  local wildcard_hostname, _, err = re_sub(hostname, "^[^\\.]+\\.", "*.", "jo")
   if err then
     ngx.log(ngx.ERR, "error: ", err)
     return uid
   end
 
-  if wildcard_hosatname then
-    uid = ngx.shared.certificate_servers:get(wildcard_hosatname)
+  if wildcard_hostname then
+    uid = certificate_servers:get(wildcard_hostname)
   end
 
   return uid

rootfs/etc/nginx/lua/plugins/README.md

@@ -14,7 +14,7 @@ By defining functions with the following names, you can run your custom Lua code
 
  - `init_worker`: useful for initializing some data per Nginx worker process
  - `rewrite`: useful for modifying request, changing headers, redirection, dropping request, doing authentication etc
- - `header`: this is called when backend response header is received, it is useful for modifying response headers
+ - `header_filter`: this is called when backend response header is received, it is useful for modifying response headers
  - `log`: this is called when request processing is commpleted and response is delivered to the client
 
 Check this [`hello_world`](https://github.com/kubernetes/ingress-nginx/tree/master/rootfs/etc/nginx/lua/plugins/hello_world) plugin as a simple example or refer to [OpenID Connect integration](https://github.com/ElvinEfendi/ingress-nginx-openidc/tree/master/rootfs/etc/nginx/lua/plugins/openidc) for more advanced usage.