Reword config description and change maximum in json schema

Change the maximum int to 40 (the length of a full commit hash), and
change the description so it makes more sense.

docs/Config.md

@@ -80,7 +80,7 @@ gui:
   showIcons: false # deprecated: use nerdFontsVersion instead
   nerdFontsVersion: "" # nerd fonts version to use ("2" or "3"); empty means don't show nerd font icons
   showFileIcons: true # for hiding file icons in the file views
-  commitHashLength: 8 # length of commit ID/ref (hash) in commits view
+  commitHashLength: 8 # length of commit hash in commits view
   commandLogSize: 8
   splitDiff: 'auto' # one of 'auto' | 'always'
   skipRewordInEditorWarning: false # for skipping the confirmation before launching the reword editor

pkg/config/user_config.go

@@ -123,8 +123,8 @@ type GuiConfig struct {
 	NerdFontsVersion string `yaml:"nerdFontsVersion" jsonschema:"enum=2,enum=3,enum="`
 	// If true (default), file icons are shown in the file views. Only relevant if NerdFontsVersion is not empty.
 	ShowFileIcons bool `yaml:"showFileIcons"`
-	// Length of commit ID/ref (hash) in commits view.
-	CommitHashLength int `yaml:"commitHashLength" jsonschema:"minimum=1,maximum=12"`
+	// Length of commit hash in commits view.
+	CommitHashLength int `yaml:"commitHashLength" jsonschema:"minimum=1,maximum=40"`
 	// If true, show commit hashes alongside branch names in the branches view.
 	ShowBranchCommitHash bool `yaml:"showBranchCommitHash"`
 	// Height of the command log view

schema/config.json

@@ -311,9 +311,9 @@
         },
         "commitHashLength": {
           "type": "integer",
-          "maximum": 12,
+          "maximum": 40,
           "minimum": 1,
-          "description": "Length of commit ID/ref (hash) in commits view.",
+          "description": "Length of commit hash in commits view.",
           "default": 8
         },
         "showBranchCommitHash": {