docs: Use @kbd correctly in ignored sections

Even when @kbd{} is not going to be rendered, it is worth spelling it
without a bogus space.
* doc/m4.texi (Improved foreach, Improved copy): Fix spacing.
* checks/get-them: Tighten regex for kbd lines.

checks/get-them

diff --git a/checks/get-them b/checks/get-them
index 9028a6e..5848db5 100755
--- a/checks/get-them
+++ b/checks/get-them
@@ -116,7 +116,7 @@
   }
   if ($0 ~ /^\^D$/)
     next;
-  if ($0 ~ /^\$ @kbd/)
+  if ($0 ~ /^\$ @kbd\{/)
     next;
   if ($0 ~ /^@result\{\}/ || $0 ~ /^@error\{\}/)
     prefix = "dnl ";

doc/m4.texi

diff --git a/doc/m4.texi b/doc/m4.texi
index baa3374..fdd2f26 100644
--- a/doc/m4.texi
+++ b/doc/m4.texi
@@ -9318,7 +9318,7 @@
 @comment examples
 @comment options: -Dlimit=10 -Dverbose
 @example
-$ @kbd {m4 -I examples -Dlimit=10 -Dverbose}
+$ @kbd{m4 -I examples -Dlimit=10 -Dverbose}
 include(`loop.m4')dnl
 @result{} 1 2 3 4 5 6 7 8 9 10
 @end example
@@ -9326,14 +9326,14 @@
 @comment examples
 @comment options: -Dlimit=2500
 @example
-$ @kbd {m4 -I examples -Dlimit=2500}
+$ @kbd{m4 -I examples -Dlimit=2500}
 include(`loop.m4')dnl
 @end example
 
 @comment examples
 @comment options: -Dlimit=10000
 @example
-$ @kbd {m4 -I examples -Dlimit=10000}
+$ @kbd{m4 -I examples -Dlimit=10000}
 define(`debug', `define(`popdef',`divert`'i')')
 @result{}
 include(`loop.m4')dnl
@@ -9345,7 +9345,7 @@
 @comment examples
 @comment options: -Dlimit=10 -Dverbose -Dalt
 @example
-$ @kbd {m4 -I examples -Dlimit=10 -Dverbose -Dalt}
+$ @kbd{m4 -I examples -Dlimit=10 -Dverbose -Dalt}
 include(`loop.m4')dnl
 @result{} 1 2 3 4 5 6 7 8 9 10
 @end example
@@ -9353,14 +9353,14 @@
 @comment examples
 @comment options: -Dlimit=2500 -Dalt
 @example
-$ @kbd {m4 -I examples -Dlimit=2500 -Dalt}
+$ @kbd{m4 -I examples -Dlimit=2500 -Dalt}
 include(`loop.m4')dnl
 @end example
 
 @comment examples
 @comment options: -Dlimit=10000 -Dalt
 @example
-$ @kbd {m4 -I examples -Dlimit=10000 -Dalt}
+$ @kbd{m4 -I examples -Dlimit=10000 -Dalt}
 define(`debug', `define(`popdef',`divert`'i')')
 @result{}
 include(`loop.m4')dnl
@@ -9372,7 +9372,7 @@
 @comment examples
 @comment options: -Dlimit=10 -Dverbose -Dalt=4
 @example
-$ @kbd {m4 -I examples -Dlimit=10 -Dverbose -Dalt=4}
+$ @kbd{m4 -I examples -Dlimit=10 -Dverbose -Dalt=4}
 include(`loop.m4')dnl
 @result{} 1 2 3 4 5 6 7 8 9 10
 @end example
@@ -9380,14 +9380,14 @@
 @comment examples
 @comment options: -Dlimit=2500 -Dalt=4
 @example
-$ @kbd {m4 -I examples -Dlimit=2500 -Dalt=4}
+$ @kbd{m4 -I examples -Dlimit=2500 -Dalt=4}
 include(`loop.m4')dnl
 @end example
 
 @comment examples
 @comment options: -Dlimit=10000 -Dalt=4
 @example
-$ @kbd {m4 -I examples -Dlimit=10000 -Dalt=4}
+$ @kbd{m4 -I examples -Dlimit=10000 -Dalt=4}
 define(`foo', `divert`'len(popdef(`_foreachq')_foreachq($@@))')dnl
 define(`debug', `pushdef(`_foreachq', defn(`foo'))')
 @result{}
@@ -9496,7 +9496,7 @@
 
 @comment examples
 @example
-$ @kbd {m4 -I examples}
+$ @kbd{m4 -I examples}
 include(`forloop3.m4')include(`stack_sep.m4')dnl
 forloop(`i', `1', `10000', `pushdef(`s', i)')
 @result{}