[PATCH] doc: Fix htmldocs build warnings of stallwarn.rst

[Zhen Lei <thunder.leizhen@huawei.com>]

Documentation/RCU/stallwarn.rst:
401: WARNING: Literal block expected; none found.
428: WARNING: Literal block expected; none found.
445: WARNING: Literal block expected; none found.
459: WARNING: Literal block expected; none found.
468: WARNING: Literal block expected; none found.

The literal block need to be indented, so add two spaces to each line.

In addition, ':', which is used as a boundary in the literal block, is
replaced by '|'.

Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
---
 Documentation/RCU/stallwarn.rst | 44 ++++++++++++++++-----------------
 1 file changed, 22 insertions(+), 22 deletions(-)

diff --git a/Documentation/RCU/stallwarn.rst b/Documentation/RCU/stallwarn.rst
index c1e92dfef40d501..0f6a58ebf5d7855 100644
--- a/Documentation/RCU/stallwarn.rst
+++ b/Documentation/RCU/stallwarn.rst
@@ -398,9 +398,9 @@ In kernels built with CONFIG_RCU_CPU_STALL_CPUTIME=y or booted with
 rcupdate.rcu_cpu_stall_cputime=1, the following additional information
 is supplied with each RCU CPU stall warning::
 
-rcu:          hardirqs   softirqs   csw/system
-rcu:  number:      624         45            0
-rcu: cputime:       69          1         2425   ==> 2500(ms)
+  rcu:          hardirqs   softirqs   csw/system
+  rcu:  number:      624         45            0
+  rcu: cputime:       69          1         2425   ==> 2500(ms)
 
 These statistics are collected during the sampling period. The values
 in row "number:" are the number of hard interrupts, number of soft
@@ -412,22 +412,22 @@ in milliseconds.  Because user-mode tasks normally do not cause RCU CPU
 stalls, these tasks are typically kernel tasks, which is why only the
 system CPU time are considered.
 
-The sampling period is shown as follows:
-:<------------first timeout---------->:<-----second timeout----->:
-:<--half timeout-->:<--half timeout-->:                          :
-:                  :<--first period-->:                          :
-:                  :<-----------second sampling period---------->:
-:                  :                  :                          :
-:          snapshot time point    1st-stall                  2nd-stall
+The sampling period is shown as follows::
 
+  |<------------first timeout---------->|<-----second timeout----->|
+  |<--half timeout-->|<--half timeout-->|                          |
+  |                  |<--first period-->|                          |
+  |                  |<-----------second sampling period---------->|
+  |                  |                  |                          |
+  |          snapshot time point    1st-stall                  2nd-stall
 
 The following describes four typical scenarios:
 
 1. A CPU looping with interrupts disabled.::
 
-   rcu:          hardirqs   softirqs   csw/system
-   rcu:  number:        0          0            0
-   rcu: cputime:        0          0            0   ==> 2500(ms)
+     rcu:          hardirqs   softirqs   csw/system
+     rcu:  number:        0          0            0
+     rcu: cputime:        0          0            0   ==> 2500(ms)
 
    Because interrupts have been disabled throughout the measurement
    interval, there are no interrupts and no context switches.
@@ -442,9 +442,9 @@ The following describes four typical scenarios:
    and CPU time consumed by hard interrupts, along with non-zero CPU
    time consumed by in-kernel execution.::
 
-   rcu:          hardirqs   softirqs   csw/system
-   rcu:  number:      624          0            0
-   rcu: cputime:       49          0         2446   ==> 2500(ms)
+     rcu:          hardirqs   softirqs   csw/system
+     rcu:  number:      624          0            0
+     rcu: cputime:       49          0         2446   ==> 2500(ms)
 
    The fact that there are zero softirqs gives a hint that these were
    disabled, perhaps via local_bh_disable().  It is of course possible
@@ -456,18 +456,18 @@ The following describes four typical scenarios:
 
    Here, only the number of context switches is zero.::
 
-   rcu:          hardirqs   softirqs   csw/system
-   rcu:  number:      624         45            0
-   rcu: cputime:       69          1         2425   ==> 2500(ms)
+     rcu:          hardirqs   softirqs   csw/system
+     rcu:  number:      624         45            0
+     rcu: cputime:       69          1         2425   ==> 2500(ms)
 
    This situation hints that the stalled CPU was looping with preemption
    disabled.
 
 4. No looping, but massive hard and soft interrupts.::
 
-   rcu:          hardirqs   softirqs   csw/system
-   rcu:  number:       xx         xx            0
-   rcu: cputime:       xx         xx            0   ==> 2500(ms)
+     rcu:          hardirqs   softirqs   csw/system
+     rcu:  number:       xx         xx            0
+     rcu: cputime:       xx         xx            0   ==> 2500(ms)
 
    Here, the number and CPU time of hard interrupts are all non-zero,
    but the number of context switches and the in-kernel CPU time consumed
-- 
2.25.1