Clean up svn README

plugins/svn/README.md

 # `svn` plugin
 
 This plugin adds some utility functions to display additional information regarding your current
-svn repsitiory. See http://subversion.apache.org/ for the full svn documentation.
+svn repository. See http://subversion.apache.org/ for the full svn documentation.
+
+To use it, add `svn` to your plugins array:
+
+```zsh
+plugins=(... svn)
+```
 
 ## Functions
 
 | Command               | Description                                 |
-|:-----------------------|:----------------------------------------|
-|svn_prompt_info         | prompt for some themes                  |
-|in_svn                  | within svn directory                    |
-|svn_get_repo_name       |                                         |
-|svn_get_branch_name     | branch name (see caveats)              |
-|svn_get_rev_nr          | revision number                         |
-|svn_dirty               | changes in this subversion repo         |
+|:----------------------|:--------------------------------------------|
+| `svn_prompt_info`     | Shows svn prompt in themes                  |
+| `in_svn`              | Checks if we're in an svn repository        |
+| `svn_get_repo_name`   | Get repository name                         |
+| `svn_get_branch_name` | Get branch name (see [caveats](#caveats))   |
+| `svn_get_rev_nr`      | Get revision number                         |
+| `svn_dirty`           | Checks if there are changes in the svn repo |
 
 ## Caveats
 
-The plugin expects the first directory to be the current branch / tag / trunk. So, it returns
+The plugin expects the first directory to be the current branch / tag / trunk. So it returns
 the first path element if you don't use branches.
 
-## Usage
+## Usage on themes
 
-To use it, add `svn` to your plugins array:
-```sh
-plugins=(... svn)
-```
+To use this in the `agnoster` theme follow these instructions:
 
-### Agnoster theme git-like prompt
+1. Enable the svn plugin
 
-Enable the svn plugin and add the followind lines to your ```~/.zshrc```
+2. Add the following lines to your `zshrc` file:
 
-```shell
-prompt_svn() {
+    ```shell
+    prompt_svn() {
         local rev branch
         if in_svn; then
             rev=$(svn_get_rev_nr)
             branch=$(svn_get_branch_name)
-        if [ `svn_dirty_choose_pwd 1 0` -eq 1 ]; then
+            if [[ $(svn_dirty_choose_pwd 1 0) -eq 1 ]]; then
                 prompt_segment yellow black
                 echo -n "$rev@$branch"
                 echo -n "±"
@@ -45,13 +48,13 @@ prompt_svn() {
                 echo -n "$rev@$branch"
             fi
         fi
-}
-```
+    }
+    ```
 
-override the agnoster build_prompt() function:
+3. Override the agnoster `build_prompt()` function:
 
-```shell
-build_prompt() {
+    ```zsh
+    build_prompt() {
         RETVAL=$?
         prompt_status
         prompt_context
@@ -59,6 +62,6 @@ build_prompt() {
         prompt_git
         prompt_svn
         prompt_end
-}
-```
+    }
+    ```