doc: break up remove-if section.

* txr.1: The remove and keep functions are missing from their
section heading. Adding them in makes the heading overstuffed,
so breaking it up. The separate function and the two lazy
functions remove-if* and keep-if* go into their own sections.

1 files changed, 34 insertions, 25 deletions

diff --git a/txr.1 b/txr.1
index 719ac2b7..48247fce 100644
--- a/txr.1
+++ b/txr.1
@@ -37375,20 +37375,16 @@ is omitted, then each element itself of
 is compared to
 .metn object .
 
-.coNP Functions @, remove-if @, keep-if @, separate @ remove-if* and @ keep-if*
+.coNP Functions @, remove @, remove-if @, keep @, keep-if @, separate @ remove-if* and @ keep-if*
 .synb
 .mets (remove < key < sequence >> [testfun >> [ keyfun <> [ mapfun ]]])
 .mets (remove-if < predfun < sequence >> [ keyfun <> [ mapfun ]])
 .mets (keep < key < sequence >> [testfun >> [ keyfun <> [ mapfun ]]])
 .mets (keep-if < predfun < sequence >> [ keyfun <> [ mapfun ]])
-.mets (separate < predfun < sequence >> [ keyfun <> [ mapfun ]])
-.mets (remove-if* < predfun < sequence >> [ keyfun <> [ mapfun ]])
-.mets (keep-if* < predfun < sequence >> [ keyfun <> [ mapfun ]])
 .syne
 .desc
 Functions in this group perform filtering of sequences,
-either retaining or rejecting items which satisfy a condition,
-or separating the two into two sequences.
+either retaining or rejecting items which satisfy a condition.
 
 The
 .code remove-if
@@ -37486,6 +37482,28 @@ It retains those items which
 .code remove
 will delete and vice versa.
 
+.TP* Examples:
+.verb
+  ;; remove any element numerically equal to 3.
+  (remove-if (op = 3) '(1 2 3 4 3.0 5)) -> (1 2 4 5)
+
+  ;; remove those pairs whose first element begins with "abc"
+  [remove-if (op equal [@1 0..3] "abc")
+             '(("abcd" 4) ("defg" 5))
+             car]
+  -> (("defg" 5))
+
+  ;; equivalent, without test function
+  (remove-if (op equal [(car @1) 0..3] "abc")
+             '(("abcd" 4) ("defg" 5)))
+  -> (("defg" 5))
+.brev
+
+.coNP Function @ separate
+.synb
+.mets (separate < predfun < sequence >> [ keyfun <> [ mapfun ]])
+.syne
+.desc
 The
 .code separate
 function combines
@@ -37525,32 +37543,23 @@ function may be understood in terms of the following reference implementation:
      seq])
 .brev
 
+.coNP Functions @ remove-if* and @ keep-if*
+.synb
+.mets (remove-if* < predfun < sequence >> [ keyfun <> [ mapfun ]])
+.mets (keep-if* < predfun < sequence >> [ keyfun <> [ mapfun ]])
+.syne
+.desc
 The
 .code remove-if*
 and
 .code keep-if*
-functions are like
+have the same argument syntax and semantics as, respectively,
 .code remove-if
 and
 .codn keep-if ,
-but produce lazy lists.
-
-.TP* Examples:
-.verb
-  ;; remove any element numerically equal to 3.
-  (remove-if (op = 3) '(1 2 3 4 3.0 5)) -> (1 2 4 5)
-
-  ;; remove those pairs whose first element begins with "abc"
-  [remove-if (op equal [@1 0..3] "abc")
-             '(("abcd" 4) ("defg" 5))
-             car]
-  -> (("defg" 5))
-
-  ;; equivalent, without test function
-  (remove-if (op equal [(car @1) 0..3] "abc")
-             '(("abcd" 4) ("defg" 5)))
-  -> (("defg" 5))
-.brev
+but with lazy semantics. These functions process
+.meta sequence
+lazily and return a lazy list.
 
 .coNP Functions @ keep-keys-if and @ separate-keys
 .synb