doc: use sentence-case for headings in docs

PR-URL: https://github.com/nodejs/node/pull/33889
Refs: https://developers.google.com/style/capitalization#capitalization-in-titles-and-headings
Refs: https://docs.microsoft.com/en-us/style-guide/capitalization
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

1 files changed, 6 insertions, 6 deletions

diff --git a/doc/api/domain.md b/doc/api/domain.md
index fa3aef66b98..b9219fbb4d7 100644
--- a/doc/api/domain.md
+++ b/doc/api/domain.md
@@ -30,7 +30,7 @@ will be notified, rather than losing the context of the error in the
 `process.on('uncaughtException')` handler, or causing the program to
 exit immediately with an error code.
 
-## Warning: Don't Ignore Errors!
+## Warning: Don't ignore errors!
 
 <!-- type=misc -->
 
@@ -199,7 +199,7 @@ are added to it.
 * `error.domainThrown` A boolean indicating whether the error was
   thrown, emitted, or passed to a bound callback function.
 
-## Implicit Binding
+## Implicit binding
 
 <!--type=misc-->
 
@@ -225,7 +225,7 @@ Implicit binding routes thrown errors and `'error'` events to the
 `Domain`.
 Implicit binding only takes care of thrown errors and `'error'` events.
 
-## Explicit Binding
+## Explicit binding
 
 <!--type=misc-->
 
@@ -432,9 +432,9 @@ d.run(() => {
 In this example, the `d.on('error')` handler will be triggered, rather
 than crashing the program.
 
-## Domains and Promises
+## Domains and promises
 
-As of Node.js 8.0.0, the handlers of Promises are run inside the domain in
+As of Node.js 8.0.0, the handlers of promises are run inside the domain in
 which the call to `.then()` or `.catch()` itself was made:
 
 ```js
@@ -472,7 +472,7 @@ d2.run(() => {
 ```
 
 Domains will not interfere with the error handling mechanisms for
-Promises. In other words, no `'error'` event will be emitted for unhandled
+promises. In other words, no `'error'` event will be emitted for unhandled
 `Promise` rejections.
 
 [`Error`]: errors.html#errors_class_error