Update texts and add links

Guides/5. LineageOSBackup.md

@@ -75,6 +75,6 @@ The recovery dialog should pop up.
 Here you can choose if you want to recover your apps and maybe even your storage.
 The restoration may take a while, be patient.  
 
-### Restoring backup from different locations 
+### Restoring backup from different locations
 
 It seems, there are a few options to restore backups, that were initially from another phone. Check this [Github Issue](https://github.com/seedvault-app/seedvault/issues/85) for a start.

Guides/InstallationIssues.md

@@ -1,16 +1,15 @@
-# Installation issues
+# Installation issues (Fairphone)
 
-## If OEM-unlock code doesn't work
+## If OEM-unlock code doesn't work on your Fairphone
 
-If you get the message "Password verification failed" on your phone after entering the unlock code.
+If you get the message "Password verification failed" on your phone after entering the correct unlock code:
-It might be the problem, that you are using an old Android version. So update your Android and try it again.
+Your current Android version might be out of date, please update.
-
-For additional information see here: https://forum.fairphone.com/t/bootloader-unlocking-code-for-fairphone-3-not-working/66685/6
 
+For additional information see the [Fairphone Forum](https://forum.fairphone.com/t/bootloader-unlocking-code-for-fairphone-3-not-working/66685/6)
 
 ## If "5. Install LinegaeOS recovery image" does not work
 
-You an try `fastboot flash boot_a <image_filename.img>` or `fastboot flash boot_b <image_filename.img>`. The `boot_a` is the name of our recovery boot partition. If your FP was rooted several times this my result in a non factory partition name ...
+You can try `fastboot flash boot_a <image_filename.img>` or `fastboot flash boot_b <image_filename.img>`. The `boot_a` is the name of our recovery boot partition. 
-
+If your FP was rooted several times this my result in a non factory partition name.
-With `fastboot getvar current-slot` you can find out whether your suffix should be `_a` or `_b`. Find more possible names at https://forum.fairphone.com/t/find-out-boot-partitions-name/77171
 
+With `fastboot getvar current-slot` you can find out whether your suffix should be `_a` or `_b`. Find more possible names in this [thread](https://forum.fairphone.com/t/find-out-boot-partitions-name/)77171

Guides/OpenGapps.md

@@ -1,5 +1,5 @@
 # OpenGapps
-If you can not live without google but want to have the LineageOS updates, there are some installation Options:
+If you need google, there are some installation Options:
 
 https://github.com/opengapps/opengapps/wiki/Package-Comparison
 

Guides/Summary.md

@@ -1,5 +1,6 @@
-1. [Prepare installation](1. PrepareInstallation.md)
+1. [Prepare installation](1.%20PrepareInstallation.md)
-2. [LineageOS installation](2. LineageOSInstallation.md)
+2. [Installation LineageOS](2.%20LineageOSInstallation.md)
-3. [Degoogle your phone](3. DegoogleLineageOS.md)
+3. [Degoogle LineageOS](3.%20DegoogleLineageOS.md)
-4. [Upgrade LineageOS17 -> 18](4. LineageOSUpgrade.md)
+4. [Upgrade LineageOS17 to 18](4.%20LineageOSUpgrade.md)
-5. [OpenGapps](OpenGapps.md)
+5. [Backing LineageOS with Seedvault](5.%20LineageOSBackup.md)
+6. [OpenGapps](OpenGapps.md)