Merge branch 'stable-3.0' into stable-3.1

* stable-3.0:
  Update git submodules
  Documentation: Escape <= characters in user-search.txt
  Documentation: Provide examples for advanced regexp searching

Change-Id: I48d09b04dbde42387a7378715adb54e4001c68dd

Documentation/user-search.txt

@@ -283,6 +283,11 @@ files named like 'name1.xml', 'name2.xml', and 'name3.xml' use
 `file:"^name[1-3].xml"`.
 +
 Slash ('/') is used path separator.
++
+More examples:
+* `-file:^path/.*` - changes that do not modify files from `path/`,
+* `file:{^~(path/.*)}` - changes that modify files not from `path/` (but may
+contain files from `path/`).
 
 [[file]]
 file:'NAME', f:'NAME'::
@@ -494,7 +499,7 @@ for the given number of lines.
 For example, added:>50 will be true for any change which adds at least 50
 lines.
 +
-Valid relations are >=, >, <=, <, or no relation, which will match if the
+Valid relations are >=, >, \<=, <, or no relation, which will match if the
 number of lines is exactly equal.
 
 [[commentby]]
@@ -546,7 +551,7 @@ True if the number of unresolved comments satisfies the given relation for the g
 For example, unresolved:>0 will be true for any change which has at least one unresolved
 comment while unresolved:0 will be true for any change which has all comments resolved.
 +
-Valid relations are >=, >, <=, <, or no relation, which will match if the number of unresolved
+Valid relations are >=, >, \<=, <, or no relation, which will match if the number of unresolved
 comments is exactly equal.
 
 == Argument Quoting
@@ -663,7 +668,7 @@ all changes that have a +2 vote from the change owner.
 Matches changes with a +1 code review where the reviewer is in the
 ldap/linux.workflow group.
 
-`label:Code-Review<=-1`::
+`label:Code-Review\<=-1`::
 +
 Matches changes with either a -1, -2, or any lower score.