Document more bind functions

Fixes #2534 as backward-kill-path-component is now documented.

doc_src/bind.txt

@@ -53,6 +53,8 @@ The following parameters are available:
 
 The following special input functions are available:
 
+- `accept-autosuggestion`, accept the current autosuggestion completely
+
 - `backward-char`, moves one character to the left
 
 - `backward-bigword`, move one whitespace-delimited word to the left
@@ -63,6 +65,8 @@ The following special input functions are available:
 
 - `backward-kill-line`, move everything from the beginning of the line to the cursor to the killring
 
+- `backward-kill-path-component`, move one path component to the left of the cursor (everything from the last "/" or whitespace exclusive) to the killring
+
 - `backward-kill-word`, move the word to the left of the cursor to the killring
 
 - `backward-word`, move one word to the left
@@ -75,6 +79,8 @@ The following special input functions are available:
 
 - `complete`, guess the remainder of the current token
 
+- `complete-and-search`, invoke the searchable pager on completion options
+
 - `delete-char`, delete one character to the right of the cursor
 
 - `delete-line`, delete the entire line
@@ -107,6 +113,12 @@ The following special input functions are available:
 
 - `kill-word`, move the next word to the killring
 
+- `suppress-autosuggestion`, remove the current autosuggestion
+
+- `transpose-chars`,  transpose two characters to the left of the cursor
+
+- `transpose-words`, transpose two words to the left of the cursor
+
 - `upcase-word`, make the current word uppercase
 
 - `yank`, insert the latest entry of the killring into the buffer