Backport: Update documentation for indent-relative functions

* lisp/indent.el (indent-relative): Document what happens when there
  is no previous nonblank line.
* doc/lispref/text.texi (Relative Indent): Document
  indent-relative-first-indent-point instead of obsolete
  indent-relative-maybe. Fix documentation of which argument from
  'indent-relative' is used.

Bug#34858

(cherry picked from commit 10cd65878c741d2a22a1f2c36c54fcad4e516f72)

1 files changed, 2 insertions, 2 deletions

diff --git a/doc/lispref/text.texi b/doc/lispref/text.texi
index fb5f56e9ddd..73312bb0caa 100644
--- a/doc/lispref/text.texi
+++ b/doc/lispref/text.texi
@@ -2570,11 +2570,11 @@ The quick brown fox jum  @point{}ped.
 @end example
 @end deffn
 
-@deffn Command indent-relative-maybe
+@deffn Command indent-relative-first-indent-point
 @comment !!SourceFile indent.el
 This command indents the current line like the previous nonblank line,
 by calling @code{indent-relative} with @code{t} as the
-@var{unindented-ok} argument.  The return value is unpredictable.
+@var{first-only} argument.  The return value is unpredictable.
 
 If the previous nonblank line has no indent points beyond the current
 column, this command does nothing.