[groff] 10/16: eqn(1): Fix content and style nits.

[G. Branden Robinson]

gbranden pushed a commit to branch master
in repository groff.

commit 6782e9917840a44a8f32fe60304dac73916ea45c
Author: G. Branden Robinson <g.branden.robinson@gmail.com>
AuthorDate: Thu Aug 24 07:48:41 2023 -0500

    eqn(1): Fix content and style nits.
    
    * Document default sizes of `thin_space` and `thick_space`.
    * Tighten and generalize wording when introducing special syntax
      characters.
    * Migrate mentions of "gfont" to "gifont".
    * Use parentheticals less.
    * Use stem form for tagged paragraph in "Files" section.  Observe that
      general eqn input is accepted, for the benefit of veterans who
      remember eqnchar.
    * Use active voice more.
---
 src/preproc/eqn/eqn.1.man | 34 +++++++++++++++++++---------------
 1 file changed, 19 insertions(+), 15 deletions(-)

diff --git a/src/preproc/eqn/eqn.1.man b/src/preproc/eqn/eqn.1.man
index b8b30f6e0..29d3208b0 100644
--- a/src/preproc/eqn/eqn.1.man
+++ b/src/preproc/eqn/eqn.1.man
@@ -270,8 +270,7 @@ the output.
 .
 .
 .P
-The following input characters not only separate tokens,
-but manage their grouping and spacing as well.
+The following input characters separate tokens along with other tasks.
 .
 .
 .TP
@@ -351,7 +350,7 @@ language.
 .
 They can configure an aspect of the preprocessor's state,
 as when setting a \[lq]global\[rq] font selection or type size
-.RB ( gfont
+.RB ( gifont
 and
 .BR gsize ),
 or declaring or deleting macros
@@ -1068,14 +1067,14 @@ or select others.
 .BI rpile\~ n\~\c
 .BR {\~ .\|.\|.\& \~}
 The integer
-.RI value\~ n
-(in hundredths of an em)
+.RI value\~ n ,
+in hundredths of an em,
 increases the vertical spacing between rows,
 using
 .IR groff 's
 .B \[rs]x
-escape sequence
-(the value has no effect in MathML mode).
+escape sequence;
+the value has no effect in MathML mode.
 .
 Negative values are accepted but have no effect.
 .
@@ -1237,7 +1236,8 @@ The width of subscripts and superscripts is increased by 
this amount
 .TP
 .B thin_space
 This amount of space is automatically inserted after punctuation
-characters.
+characters
+.RB ( 17 ).
 .
 .
 .TP
@@ -1250,7 +1250,8 @@ binary operators
 .TP
 .B thick_space
 This amount of space is automatically inserted on either side of
-relations.
+relations
+.RB ( 28 ).
 .
 .
 .TP
@@ -1891,16 +1892,19 @@ The default output device is
 .
 .TP
 .I @MACRODIR@/\:\%eqnrc
-Initialization file.
+initializes the preprocessor.
+.
+Any
+.I @g@eqn
+valid input is accepted.
 .
 .
 .\" ====================================================================
 .SH "MathML mode limitations"
 .\" ====================================================================
 .
-MathML is designed on the assumption that it cannot know the exact
-physical characteristics of the media and devices on which it will
-be rendered.
+MathML's design assumes that it cannot know the exact physical
+characteristics of the media and devices on which it will be rendered.
 .
 It does not support control of motions and sizes to the same
 degree
@@ -1986,12 +1990,12 @@ For instance,
 the
 .I eqn \" generic
 command
-.RB \%\[lq]\^ "gfont PI" \^\[rq]
+.RB \%\[lq]\^ "gifont PI" \^\[rq]
 does not select
 .IR groff 's
 Palatino italic font for the global italic face;
 you must use
-.RB \%\[lq]\^ "gfont \[dq]PI\[dq]" \^\[rq]
+.RB \%\[lq]\^ "gifont \[dq]PI\[dq]" \^\[rq]
 instead.
 .
 .