ulp: add documentation for JUMPS instruction conditions

Hardware implements conditions LE, LT, GE, and conditions EQ and GT
are implemented in the assembler by emitting two JUMPS instructions
with other conditions.

Author: igrr

docs/en/api-guides/ulp_instruction_set.rst

@@ -512,10 +512,29 @@ Note that when accessing RTC memories and RTC registers, ULP coprocessor has low
    - *Condition*:
        - *EQ* (equal) – jump if value in stage_cnt == threshold
        - *LT* (less than) –  jump if value in stage_cnt < threshold
+       - *LE* (less or equal) - jump if value in stage_cnt <= threshold
        - *GT* (greater than) –  jump if value in stage_cnt > threshold
+       - *GE* (greater or equal) — jump if value in stage_cnt >= threshold
 
 **Cycles**
-  2 cycles to execute, 2 cycles to fetch next instruction
+  Conditions *LE*, *LT*, *GE*: 2 cycles to execute, 2 cycles to fetch next instruction
+
+  Conditions *EQ*, *GT* are implemented in the assembler using two **JUMPS** instructions::
+
+    // JUMPS target, threshold, EQ is implemented as:
+
+             JUMPS next, threshold, LT
+             JUMPS target, threshold, LE
+    next:
+
+    // JUMPS target, threshold, GT is implemented as:
+    
+             JUMPS next, threshold, LE
+             JUMPS target, threshold, GE
+    next:
+
+  Therefore the execution time will depend on the branches taken: either 2 cycles to execute + 2 cycles to fetch, or 4 cycles to execute + 4 cycles to fetch.
+
 
 **Description**
     The instruction makes a jump to a relative address if condition is true. Condition is the result of comparison of count register value and threshold value.