more fixes in docs

README.md

@@ -222,7 +222,7 @@ it's expected that variable `$bound_var` will return numbers in range *0 –
 11* according to the number of the histogram bins. If it returns some unexpected
 value then variable `$hst_name_err` (which is declared implicitly) will be
 incremented instead of the histogram counters. The counters themselves and their
-sum value can be accessed directly via implicitly declared variable
+sum value can be accessed directly via implicitly declared variables
 `$hst_name_00 .. $hst_name_11` and `$hst_name_sum`.
 
 An example
@@ -494,9 +494,9 @@ $ curl -s 'http://127.0.0.1:8020/all' | jq {\"test.histogram\"}
 }
 ```
 
-From this output we can see that there were *70* requests spread in bins
-*04 – 06* which correspond approximately to a time range from *0.5* to *1*
-and more seconds.
+From this output, we can see that there were *70* requests spread in bins
+*04 – 06* which correspond approximately to a time range from *0.5* to *1
+and more* seconds.
 
 Let's see how to access all the bins and a specific bin.