Improve wording (#17)

Don't use word "behaviour" as it is clear that it is a behaviour.

Use verb "Filter" as prefix (not noun "filtering" as postfix) to comply
with other behaviours (e.g. "Filter by name..." from scm-api-plugin).

Use word "pattern" (not "tag") as users may be confused because git
itself uses tags.

Quote the patterns to make clear that "[" and "]" have to be contained
literally and are not just used as delimiters in the help itself.

README.md

@@ -1,10 +1,9 @@
 # Commit skip SCM filters
 
-This repo is a collection of traits for several SCM Jenkins plugins.
+This repository contains a collection of traits for several branch-source Jenkins plugins.
 
 It provides filters for
- - GitHub: Filtering pull requests 
+ - GitHub: Filtering pull requests
  - Bitbucket: Filtering pull requests
 
-
-The filtering will be performed matching the last commit message, applying it whether it contains the tags [skip ci] or [ci skip]. The check is case-insensitive.
+The filtering will be performed matching the last commit message, applying it whether it contains the patterns "[skip ci]" or "[ci skip]". The check is case-insensitive.

scm-trait-commit-skip-common/src/main/java/org/jenkinsci/plugins/scm_filter/BranchCommitSkipTrait.java

@@ -22,7 +22,7 @@ abstract static class BranchCommitSkipTraitDescriptorImpl extends SCMSourceTrait
 
         @Override
         public String getDisplayName() {
-            return "Commit message filtering behaviour (branches)";
+            return "Filter branches by commit message";
         }
 
         @Override

scm-trait-commit-skip-common/src/main/java/org/jenkinsci/plugins/scm_filter/CommitSkipTrait.java

@@ -22,7 +22,7 @@ abstract static class CommitSkipTraitDescriptorImpl extends SCMSourceTraitDescri
 
         @Override
         public String getDisplayName() {
-            return "Commit message filtering behaviour (pull requests)";
+            return "Filter pull requests by commit message";
         }
 
         @Override

scm-trait-commit-skip-common/src/main/resources/org/jenkinsci/plugins/scm_filter/BranchCommitSkipTrait/help.html

@@ -1,3 +1,3 @@
 <div>
-    Defines whether a branch should be excluded. Will be so if the last commit contains the tags [ci skip] or [skip ci] (case insensitive).
-</div>
+    Branches whose last commit's message contains (case insensitive) the pattern "[ci skip]" or "[skip ci]" will be ignored.
+</div>

scm-trait-commit-skip-common/src/main/resources/org/jenkinsci/plugins/scm_filter/CommitSkipTrait/help.html

@@ -1,3 +1,3 @@
 <div>
-    Defines whether a pull request creation or sync should be excluded. Will be so if the last commit contains the tags [ci skip] or [skip ci] (case insensitive).
-</div>
+    Pull requests whose last commit's message contains (case insensitive) the pattern "[ci skip]" or "[skip ci]" will be ignored.
+</div>