i2pd.md/transmission_daemon.md: s/uPNP/UPnP/g: Use correct casing

docs/guides/file_sharing/transmission_daemon.md

@@ -103,7 +103,7 @@ firewall-cmd --permanent --zone=public --add-port=9091/tcp
 firewall-cmd --runtime-to-permanent
 ```
 
-If you are not behind a NAT-PMP, uPNP-enabled router, or connected without NAT, you must forward the BitTorrent port (`12345` in our example). Each router is different, but as an example on the author's MikroTik router:
+If you are not behind a NAT-PMP, UPnP-enabled router, or connected without NAT, you must forward the BitTorrent port (`12345` in our example). Each router is different, but as an example on the author's MikroTik router:
 
 ```bash
 /ip firewall nat add action=dst-nat chain=dstnat dst-port=12345 in-interface=ether1 protocol=tcp to-addresses=SERVER_IP to-ports=12345

docs/guides/proxies/i2pd.md

@@ -18,7 +18,7 @@ tags:
 
 The following are minimum requirements for using this procedure:
 
-- A public IPv4 or IPv6 address, whether directly on the server, with port forwarding, or uPNP/NAT-PMP
+- A public IPv4 or IPv6 address, whether directly on the server, with port forwarding, or UPnP/NAT-PMP
 
 ## Installing `i2pd`
 
@@ -45,7 +45,7 @@ vim /etc/i2pd/i2pd.conf
 
 The default `i2pd.conf` file is pretty descriptive, but can get long if you just want a basic configuration, you can leave as-is.
 
-However, if you want to enable IPv6 and uPNP and listen the HTTP proxy to port `12345`, a configuration allowing this is as follows:
+However, if you want to enable IPv6 and UPnP and listen the HTTP proxy to port `12345`, a configuration allowing this is as follows:
 
 ```bash
 ipv6 = true