doc: use consistent plural form of "index"

Our documentation uses both "indices" and "indexes" as the plural form
of "index". The Microsoft Style Guide, which we've adopted for
documentation, says to use "indexes" so let's standardize on that.

Ref: https://learn.microsoft.com/en-us/style-guide/a-z-word-list-term-collections/i/index-indexes-indices
PR-URL: nodejs#52373
Refs: https://learn.microsoft.com/en-us/style-guide/a-z-word-list-term-collections/i/index-indexes-indices
Reviewed-By: Antoine du Hamel <duhamelantoine1995@gmail.com>
Reviewed-By: Filip Skokan <panva.ip@gmail.com>
Reviewed-By: Anna Henningsen <anna@addaleax.net>
Reviewed-By: Yagiz Nizipli <yagiz.nizipli@sentry.io>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Ulises Gascón <ulisesgascongonzalez@gmail.com>
Reviewed-By: Benjamin Gruenbaum <benjamingr@gmail.com>

Author: Trott

doc/api/buffer.md

@@ -2224,7 +2224,7 @@ added: v1.1.0
 
 * Returns: {Iterator}
 
-Creates and returns an [iterator][] of `buf` keys (indices).
+Creates and returns an [iterator][] of `buf` keys (indexes).
 
 ```mjs
 import { Buffer } from 'node:buffer';
@@ -3343,7 +3343,7 @@ added: v3.0.0
 * Returns: {Buffer}
 
 Returns a new `Buffer` that references the same memory as the original, but
-offset and cropped by the `start` and `end` indices.
+offset and cropped by the `start` and `end` indexes.
 
 Specifying `end` greater than [`buf.length`][] will return the same result as
 that of `end` equal to [`buf.length`][].
@@ -3470,7 +3470,7 @@ changes:
 > Stability: 0 - Deprecated: Use [`buf.subarray`][] instead.
 
 Returns a new `Buffer` that references the same memory as the original, but
-offset and cropped by the `start` and `end` indices.
+offset and cropped by the `start` and `end` indexes.
 
 This method is not compatible with the `Uint8Array.prototype.slice()`,
 which is a superclass of `Buffer`. To copy the slice, use

doc/api/dgram.md

@@ -741,7 +741,7 @@ added: v8.6.0
 * `multicastInterface` {string}
 
 _All references to scope in this section are referring to
-[IPv6 Zone Indices][], which are defined by [RFC 4007][]. In string form, an IP
+[IPv6 Zone Indexes][], which are defined by [RFC 4007][]. In string form, an IP
 with a scope index is written as `'IP%scope'` where scope is an interface name
 or interface number._
 
@@ -988,7 +988,7 @@ interfaces" address on a random port (it does the right thing for both `udp4`
 and `udp6` sockets). The bound address and port can be retrieved using
 [`socket.address().address`][] and [`socket.address().port`][].
 
-[IPv6 Zone Indices]: https://en.wikipedia.org/wiki/IPv6_address#Scoped_literal_IPv6_addresses
+[IPv6 Zone Indexes]: https://en.wikipedia.org/wiki/IPv6_address#Scoped_literal_IPv6_addresses
 [RFC 4007]: https://tools.ietf.org/html/rfc4007
 [`'close'`]: #event-close
 [`ERR_SOCKET_BAD_PORT`]: errors.md#err_socket_bad_port

doc/api/documentation.md

@@ -21,7 +21,7 @@ Throughout the documentation are indications of a section's stability. Some APIs
 are so proven and so relied upon that they are unlikely to ever change at all.
 Others are brand new and experimental, or known to be hazardous.
 
-The stability indices are as follows:
+The stability indexes are as follows:
 
 > Stability: 0 - Deprecated. The feature may emit warnings. Backward
 > compatibility is not guaranteed.

doc/api/events.md

@@ -962,7 +962,7 @@ myEmitter.emit('event');
 ```
 
 Because listeners are managed using an internal array, calling this will
-change the position indices of any listener registered _after_ the listener
+change the position indexes of any listener registered _after_ the listener
 being removed. This will not impact the order in which listeners are called,
 but it means that any copies of the listener array as returned by
 the `emitter.listeners()` method will need to be recreated.

doc/api/n-api.md

@@ -2218,9 +2218,9 @@ typedef enum {
 } napi_key_conversion;
 ```
 
-`napi_key_numbers_to_strings` will convert integer indices to
+`napi_key_numbers_to_strings` will convert integer indexes to
 strings. `napi_key_keep_numbers` will return numbers for integer
-indices.
+indexes.
 
 #### `napi_valuetype`