[bug #60379] doc/meref.me: correct various small issues

[G. Branden Robinson]

Update of bug #60379 (project groff):

                  Status:                    None => Fixed                  
             Assigned to:                    None => gbranden               
             Open/Closed:                    Open => Closed                 
         Planned Release:                    None => 1.23.0                 

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Follow-up Comment #1:


commit ae2000bd718c324bcf3e31e2c4348620905b0b7d
Author: Dave Kemper <saint.snit@gmail.com>
Date:   Mon Apr 12 03:57:12 2021 +0000

    doc/meref.me: Correct various small issues.
    
    - Change names of two diacritical marks to match Unicode usage: "circle"
      to "ring," "Czech" to "caron"
    - Correct description of caron from "inverted" to "raised" v
    - Correct description of string \*- from "3/4 em dash" to "em dash"
    - Remove some excess verbiage
    - Correct some minor typos and punctuation
    
    Fixes <https://savannah.gnu.org/bugs/?60379>.


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