Modify rule S1155: Adopt standard library method names

Co-authored-by: Marco Borgeaud <[email protected]>
Co-authored-by: Michael Jabbour <[email protected]>

rules/S1155/cfamily/metadata.json

@@ -1,5 +1,5 @@
 {
-  "title": "\"empty()\" or \"is_empty()\" should be used to test for emptiness",
+  "title": "\"empty()\" should be used to test for emptiness",
   "tags": [
     "cppcoreguidelines",
     "clumsy"

rules/S1155/cfamily/rule.adoc

@@ -1,8 +1,8 @@
 == Why is this an issue?
 
-When you call `empty()` or `is_empty()`, it clearly communicates the code's intention, which is to check if the collection is empty. Using `size() == 0` for this purpose is less direct and makes the code slightly more complex.
+When you call `empty()`, it clearly communicates the code's intention, which is to check if the collection is empty. Using `size() == 0` for this purpose is less direct and makes the code slightly more complex.
 
-Moreover, depending on the implementation, the `size()`, `length()`, or `count()` methods can have a time complexity of `O(n)` where `n` is the number of elements in the collection. On the other hand, `empty()` and `is_empty()` simply check if there is at least one element in the collection, which is a constant time operation, `O(1)`.
+Moreover, in the standard library, depending on the implementation, the `size()` method can have a time complexity of `O(n)` where `n` is the number of elements in the collection. On the other hand, `empty()` simply checks if there is at least one element in the collection, which is a constant time operation, `O(1)`. Note that this rule also identifies similar method names in user-defined types, where the semantics and complexity may differ.
 
 [source,cpp,diff-id=1,diff-type=noncompliant]
 ----
@@ -13,7 +13,7 @@ void fun(const std::vector<int> &myVector) {
 }
 ----
 
-Prefer using `empty()` or `is_empty()` to test for emptiness over `size()`, `length()`, or `count()`.
+Prefer using `empty()` or to test for emptiness over `size()`.
 
 [source,cpp,diff-id=1,diff-type=compliant]
 ----
@@ -38,7 +38,7 @@ ifdef::env-github,rspecator-view[]
 
 === Message
 
-Use empty() or is_empty() to check whether the container is empty or not.
+Use empty() to check whether the container is empty or not.
 
 '''
 == Comments And Links