Minor docs formatting cleanup

docs/prerequisites.md

@@ -6,16 +6,16 @@
 
 - [Python](https://www.python.org/) being installed on the server. Most distributions install Python by default, but some don't (e.g. Ubuntu 18.04) and require manual installation (something like `apt-get install python`).
 
-- a `cron`-like tool installed on the server such as `cron` or `anacron` to automatically schedule the Let's Encrypt SSL certificates's renewal. *This can be ignored if you use your own SSL certificates.*
+- A `cron`-like tool installed on the server such as `cron` or `anacron` to automatically schedule the Let's Encrypt SSL certificates's renewal. *This can be ignored if you use your own SSL certificates.*
 
-- the [Ansible](http://ansible.com/) program being installed on your own computer. It's used to run this playbook and configures your server for you. Take a look at [our guide about Ansible](ansible.md) for more information, as well as [version requirements](ansible.md#supported-ansible-versions) and alternative ways to run Ansible.
+- The [Ansible](http://ansible.com/) program being installed on your own computer. It's used to run this playbook and configures your server for you. Take a look at [our guide about Ansible](ansible.md) for more information, as well as [version requirements](ansible.md#supported-ansible-versions) and alternative ways to run Ansible.
 
-- either the `dig` tool or `python-dns` installed on your own computer. Used later on, by the playbook's [services check](maintenance-checking-services.md) feature.
+- Either the `dig` tool or `python-dns` installed on your own computer. Used later on, by the playbook's [services check](maintenance-checking-services.md) feature.
 
-- an HTTPS-capable web server at the base domain name (`<your-domain>`) which is capable of serving static files. Unless you decide to [Serve the base domain from the Matrix server](configuring-playbook-base-domain-serving.md) or alternatively, to use DNS SRV records for [Server Delegation](howto-server-delegation.md).
+- An HTTPS-capable web server at the base domain name (`<your-domain>`) which is capable of serving static files. Unless you decide to [Serve the base domain from the Matrix server](configuring-playbook-base-domain-serving.md) or alternatively, to use DNS SRV records for [Server Delegation](howto-server-delegation.md).
 
-- properly configured DNS records for `<your-domain>` (details in [Configuring DNS](configuring-dns.md))
+- Properly configured DNS records for `<your-domain>` (details in [Configuring DNS](configuring-dns.md)).
 
-- some TCP/UDP ports open. This playbook configures the server's internal firewall for you. In most cases, you don't need to do anything special. But **if your server is running behind another firewall**, you'd need to open these ports: `80/tcp` (HTTP webserver), `443/tcp` (HTTPS webserver), `3478/tcp` (TURN over TCP), `3478/udp` (TURN over UDP), `5349/tcp` (TURN over TCP), `5349/udp` (TURN over UDP), `8448/tcp` (Matrix Federation API HTTPS webserver), the range `49152-49172/udp` (TURN over UDP), `4443/tcp` (Jitsi Harvester fallback), `10000/udp` (Jitsi video RTP). Depending on your firewall/NAT setup, incoming RTP packets on port 10000 may have the external IP of your firewall as destination address, due to the usage of [STUN](../roles/matrix-jitsi/defaults/main.yml#L147) in JVB.
+- Some TCP/UDP ports open. This playbook configures the server's internal firewall for you. In most cases, you don't need to do anything special. But **if your server is running behind another firewall**, you'd need to open these ports: `80/tcp` (HTTP webserver), `443/tcp` (HTTPS webserver), `3478/tcp` (TURN over TCP), `3478/udp` (TURN over UDP), `5349/tcp` (TURN over TCP), `5349/udp` (TURN over UDP), `8448/tcp` (Matrix Federation API HTTPS webserver), the range `49152-49172/udp` (TURN over UDP), `4443/tcp` (Jitsi Harvester fallback), `10000/udp` (Jitsi video RTP). Depending on your firewall/NAT setup, incoming RTP packets on port 10000 may have the external IP of your firewall as destination address, due to the usage of [STUN](../roles/matrix-jitsi/defaults/main.yml#L147) in JVB.
 
 When ready to proceed, continue with [Configuring DNS](configuring-dns.md).