[#162] Fix pre-commit warnings

Signed-off-by: Evgenii Stratonikov <e.stratonikov@yadro.com>

doc/policy.md

@@ -101,16 +101,16 @@ In a nutshell, a `SELECT` takes a filter result as input and outputs a specific
 Let's see some examples
 ```sql
 -- Selects exactly one node from the entire netmap
-SELECT 1 FROM *               
+SELECT 1 FROM *  
 
 -- Same as above, but with an identifier for the selection
-SELECT 1 FROM * AS ONE        
+SELECT 1 FROM * AS ONE  
 
--- Selects two nodes from the RedOrBlueNodes filter, such that both selected nodes 
+-- Selects two nodes from the RedOrBlueNodes filter, such that both selected nodes
 -- share the same value for the Color attribute, i.e. both red or both blue.
-SELECT 2 IN SAME Color FROM RedOrBlueNodes 
+SELECT 2 IN SAME Color FROM RedOrBlueNodes
 
--- Selects two nodes from the RedOrBlueNodes filter, such that the selected nodes 
+-- Selects two nodes from the RedOrBlueNodes filter, such that the selected nodes
 -- have distinct values for the Color attribute, i.e. one red and one blue.
 -- The selection is also given an identifier.
 SELECT 2 IN DISTINCT Color FROM RedOrBlueNodes AS MyNodes
@@ -173,18 +173,18 @@ In additional to this basic syntax, there are a couple of additional useful opti
 
 ### The policy playground
 
-> ℹ️ This section assumes you have an up-to-date version of the `frostfs-cli`. 
+> ℹ️ This section assumes you have an up-to-date version of the `frostfs-cli`.
 
 While simple placement policies have predictable results that can be understood at a glance, more complex ones need careful consideration before deployment. In order to simplify understanding a policy's outcome and experimenting while learning, a builtin tool is provided as part of the `frostfs-cli` for this purpose: the policy playground.
 
-For the remainder of this guide, we will use the policy playground to setup a virtual netmap (that is, one that doesn't require any networking or deployment) and test various policies. In order to visualize this netmap easily, each node will have three attributes: a character, a shape and a color 
+For the remainder of this guide, we will use the policy playground to setup a virtual netmap (that is, one that doesn't require any networking or deployment) and test various policies. In order to visualize this netmap easily, each node will have three attributes: a character, a shape and a color
 
 ![Sample Netmap](./image/sample_netmap.svg)
 
 We can start the policy playground as follows:
 ```sh
 $ frostfs-cli container policy-playground
-> 
+>
 ```
 
 Since we didn't pass any endpoint, the initial netmap is empty, which we can verify with the `ls` command (to list the nodes in the netmap):
@@ -400,7 +400,7 @@ FILTER Color EQ 'Green' AS GreenNodes
 #### Example #6
 ```sql
 REP 1 IN MyNodes
-REP 2 
+REP 2
 CBF 2
 SELECT 1 FROM CuteNodes AS MyNodes
 FILTER (Color EQ 'Blue') AND NOT (Shape EQ 'Circle' OR Shape EQ 'Square') AS CuteNodes
@@ -442,4 +442,4 @@ Others:
 - `ls`: list nodes in the current netmap and their attributes
 - `add`: add a node to the current netmap. If it already exists, it will be overwritten.
 - `remove`: remove a node from the current netmap.
-- `eval`: evaluate a placement policy on the current netmap.
+- `eval`: evaluate a placement policy on the current netmap.