Fix typos and improve wording

docs/configuring-playbook-nginx.md

@@ -26,26 +26,24 @@ matrix_nginx_proxy_proxy_matrix_nginx_status_allowed_addresses:
 
 ## Adjusting SSL in your server
 
-You can adjust how the SSL is served by the nginx server by setting the `matrix_nginx_proxy_ssl_preset`. This is based on the Mozilla Server Side TLS
-Recommended configurations. It changes the TLS Protocol, the SSL Cipher Suites and the `ssl_prefer_server_ciphers` variable of nginx.
-The posible values are:
+You can adjust how the SSL is served by the nginx server using the `matrix_nginx_proxy_ssl_preset` variable. We support a few presets, based on the Mozilla Server Side TLS
+Recommended configurations. These presets influence the TLS Protocol, the SSL Cipher Suites and the `ssl_prefer_server_ciphers` variable of nginx.
+Possible values are:
 
-- "modern" - For Modern clients that support TLS 1.3, with no need for backwards compatibility
-- "intermediate" - Recommended configuration for a general-purpose server
-- "old" - Services accessed by very old clients or libraries, such as Internet Explorer 8 (Windows XP), Java 6, or OpenSSL 0.9.8
+- `"modern"` - For Modern clients that support TLS 1.3, with no need for backwards compatibility
+- `"intermediate"` (**default**) - Recommended configuration for a general-purpose server
+- `"old"` - Services accessed by very old clients or libraries, such as Internet Explorer 8 (Windows XP), Java 6, or OpenSSL 0.9.8
 
-The default is set to `"intermediate"`.
+**Be really carefull when setting it to `"modern"`**. This could break comunication with other Matrix servers, limiting your federation posibilities. The
+[Federarion tester](https://federationtester.matrix.org/) also won't work.
 
-**Be really carefull when setting it to "modern"**. This could break the comunication with other matrix servers, limiting your feration posibilities and the
-[Federarion tester](https://federationtester.matrix.org/) won't work.
-
-If you want to override one of the values used by the preset, you can use this three variables:
+Besides changing the preset (`matrix_nginx_proxy_ssl_preset`), you can also directly override these 3 variables:
 
 - `matrix_nginx_proxy_ssl_protocols`: for specifying the supported TLS protocols.
-- `matrix_nginx_proxy_ssl_prefer_server_ciphers`: for specifying if the server or the client choice when negociating the chipher. It can set to "on" or "off".
+- `matrix_nginx_proxy_ssl_prefer_server_ciphers`: for specifying if the server or the client choice when negotiating the cipher. It can set to `on` or `off`.
 - `matrix_nginx_proxy_ssl_ciphers`: for specifying the SSL Cipher suites used by nginx.
 
-For more information about this variables, check the `roles/matrix-nginx-proxy/defaults/main.yml` file.
+For more information about these variables, check the `roles/matrix-nginx-proxy/defaults/main.yml` file.
 
 ## Synapse + OpenID Connect for Single-Sign-On