Remove some redundant quotes from examples

* dev/examples.el (-split-on): Unquote self-quoting keywords.

* README.md:
* dash.texi: Regenerate docs.

README.md

@@ -1480,8 +1480,8 @@ See also [`-split-when`](#-split-when-fn-list)
 
 ```el
 (-split-on '| '(Nil | Leaf a | Node [Tree a])) ;; => ((Nil) (Leaf a) (Node [Tree a]))
-(-split-on ':endgroup '("a" "b" :endgroup "c" :endgroup "d" "e")) ;; => (("a" "b") ("c") ("d" "e"))
-(-split-on ':endgroup '("a" "b" :endgroup :endgroup "d" "e")) ;; => (("a" "b") ("d" "e"))
+(-split-on :endgroup '("a" "b" :endgroup "c" :endgroup "d" "e")) ;; => (("a" "b") ("c") ("d" "e"))
+(-split-on :endgroup '("a" "b" :endgroup :endgroup "d" "e")) ;; => (("a" "b") ("d" "e"))
 ```
 
 #### -split-when `(fn list)`

dash.texi

@@ -2070,11 +2070,11 @@ See also @code{-split-when} (@pxref{-split-when})
     @result{} ((Nil) (Leaf a) (Node [Tree a]))
 @end group
 @group
-(-split-on ':endgroup '("a" "b" :endgroup "c" :endgroup "d" "e"))
+(-split-on :endgroup '("a" "b" :endgroup "c" :endgroup "d" "e"))
     @result{} (("a" "b") ("c") ("d" "e"))
 @end group
 @group
-(-split-on ':endgroup '("a" "b" :endgroup :endgroup "d" "e"))
+(-split-on :endgroup '("a" "b" :endgroup :endgroup "d" "e"))
     @result{} (("a" "b") ("d" "e"))
 @end group
 @end example

dev/examples.el

@@ -806,11 +806,11 @@ value rather than consuming a list to produce a single value."
 
   (defexamples -split-on
     (-split-on '| '(Nil | Leaf a | Node [Tree a])) => '((Nil) (Leaf a) (Node [Tree a]))
-    (-split-on ':endgroup '("a" "b" :endgroup "c" :endgroup "d" "e")) => '(("a" "b") ("c") ("d" "e"))
-    (-split-on ':endgroup '("a" "b" :endgroup :endgroup "d" "e")) => '(("a" "b") ("d" "e"))
-    (-split-on ':endgroup '("a" "b" :endgroup "c" :endgroup)) => '(("a" "b") ("c"))
-    (-split-on ':endgroup '("a" "b" :endgroup :endgroup :endgroup "d" "e")) => '(("a" "b") ("d" "e"))
-    (-split-on ':endgroup '(:endgroup "c" :endgroup "d" "e")) => '(("c") ("d" "e"))
+    (-split-on :endgroup '("a" "b" :endgroup "c" :endgroup "d" "e")) => '(("a" "b") ("c") ("d" "e"))
+    (-split-on :endgroup '("a" "b" :endgroup :endgroup "d" "e")) => '(("a" "b") ("d" "e"))
+    (-split-on :endgroup '("a" "b" :endgroup "c" :endgroup)) => '(("a" "b") ("c"))
+    (-split-on :endgroup '("a" "b" :endgroup :endgroup :endgroup "d" "e")) => '(("a" "b") ("d" "e"))
+    (-split-on :endgroup '(:endgroup "c" :endgroup "d" "e")) => '(("c") ("d" "e"))
     (-split-on '| '(Nil | | Node [Tree a])) => '((Nil) (Node [Tree a])))
 
   (defexamples -split-when