Fixing broken links in doc files (#112)

Author: mRrvz

README.md

@@ -347,7 +347,7 @@ crud.select('customers', {{'<=', 'age', 35}})
 **Note**: tuples are sorted by age because space has index `age`.
 Otherwise, tuples are sorted by primary key.
 
-See more examples of select queries [here.](https://github.com/tarantool/crud/docs/select.md)
+See more examples of select queries [here.](https://github.com/tarantool/crud/blob/master/doc/select.md)
 
 ### Pairs
 
@@ -372,7 +372,7 @@ for _, object in crud.pairs('customers', {{'<=', 'age', 35}}, {use_tomap = true}
 end
 ```
 
-See more examples of pairs queries [here.](https://github.com/tarantool/crud/docs/pairs.md)
+See more examples of pairs queries [here.](https://github.com/tarantool/crud/blob/master/doc/pairs.md)
 
 ### Truncate
 

doc/pairs.md

@@ -1,7 +1,7 @@
 # Pairs examples
 
 With ``crud.pairs``, you can iterate across a distributed space.  
-The arguments are the same as [``crud.select``](https://github.com/tarantool/crud/docs/select.md), except of the ``use_tomap`` parameter.  
+The arguments are the same as [``crud.select``](https://github.com/tarantool/crud/blob/master/doc/select.md), except of the ``use_tomap`` parameter.  
 Below are examples that may help you.
 
 ## Getting space
@@ -76,7 +76,7 @@ objects
 
 ## Pagination
 
-``crud.pairs``, like [``crud.select``](https://github.com/tarantool/crud/doc/select#pagination), supports pagination.  
+``crud.pairs``, like [``crud.select``](https://github.com/tarantool/crud/blob/master/doc/select.md#pagination), supports pagination.  
 To use it, combine the ``first`` and ``after`` parameters. 
 
 **Example:**

doc/select.md

@@ -209,7 +209,7 @@ res
 ...
 ```
 
-With this request, we got objects behind the objects from the [previous example](https://github.com/tarantool/crud/doc/select#first-parameter)
+With this request, we got objects behind the objects from the [previous example](https://github.com/tarantool/crud/blob/master/doc/select.md#first-parameter)
 
 ### Combine ``first`` and ``after``