user/all-features-by-client.md: align columns (attempt 3)

Left and centre justify columns.
Spaces required before and after columns.

Change-Id: Ica090bcaf3acd506674201fc11560ee3347c81be

user/all-features-by-client.md

@@ -3,7 +3,7 @@
 ## Legend
 
 | Key     | Description                                                 |
-|:-------:| ----------------------------------------------------------- |
+| :-----: | :---------------------------------------------------------- |
 | ✓       | Available                                                   |
 | 🧪      | Experimental                                                |
 | ×       | Not yet available                                           |
@@ -16,7 +16,7 @@
 ## Text messaging
 
 | Client                             | Desktop | Android | Android TV | iOS | Web |
-| ---------------------------------- |:-------:|:-------:|:----------:|:---:|:---:|
+| :--------------------------------- | :-----: | :-----: | :--------: | :-: | :-: |
 | Text messaging                     |    ✓    |    ✓    |     ✓      |  ✓  |  ✓  |
 | Group chat                         |    ✓    |    ✓    |     ×      |  ✓  |  ✓  |
 | Public chat                        |    ×    |    ×    |     ×      |  ×  |  ?  |
@@ -42,7 +42,7 @@
 ## Calling
 
 | Client                             | Desktop | Android | Android TV | iOS  | Web |
-| ---------------------------------- |:-------:|:-------:|:----------:|:----:|:---:|
+| :--------------------------------- | :-----: | :-----: | :--------: | :--: | :-: |
 | Audio calls                        |    ✓    |    ✓    |     ✓      |  ✓   |  ×  |
 | Video calls                        |    ✓    |    ✓    |     ✓      |  ✓   |  ×  |
 | Group calls                        |    🧪   |    ✓    |     🧪      |  ×   |  ×  |
@@ -80,7 +80,7 @@
 ## Account settings
 
 | Client                      | Desktop | Android | Android TV | iOS | Web |
-| --------------------------- |:-------:|:-------:|:----------:|:---:|:---:|
+| :-------------------------- | :-----: | :-----: | :--------: | :-: | :-: |
 | Profile picture             |    ✓    |    ✓    |     ✓      |  ✓  |  ✓  |
 | Disable account             |    ✓    |    ✓    |     ×      |  ✓  |  ×  |
 | Delete account              |    ✓    |    ✓    |     ×      |  ✓  |  ✓  |
@@ -96,7 +96,7 @@
 ## Other features
 
 | Client                         | Desktop | Android | Android TV | iOS | Web  |
-| ------------------------------ |:-------:|:-------:|:----------:|:---:|:----:|
+| :----------------------------- | :-----: | :-----: | :--------: | :-: | :--: |
 | Scan QR code                   |    ×    |    ✓    |     ×      |  ✓  |  ✓   |
 | Display QR code                |    ✓    |    ✓    |     ✓      |  ✓  |  ✓   |
 | Block contact                  |    ✓    |    ✓    |     ×      |  ✓  |  ✓   |
@@ -121,7 +121,7 @@
 ## Advanced settings
 
 | Client             | Desktop | Android | Android TV | iOS | Web |
-| ------------------ |:-------:|:-------:|:----------:|:---:|:---:|
+| :----------------- | :-----: | :-----: | :--------: | :-: | :-: |
 | DHT proxy support  |    ✓    |    ✓    |     ×      |  ✓  |  🚫 |
 | Push notification  |    🚫   |    ✓    |     🚫     |  ✓  |  🚫 |
 | UPnP               |    ✓    |    ✓    |     ✓      |  ×  |  🚫 |