doc: fix all headings to use title case

While we hoped to make the headings consistent over time while doing
other edits, we should instead just make the squirrels happy and do them
all at once or they'll likely never be made consistent.

A python script was used to find the headings, and then a call to
https://pypi.org/project/titlecase to transform the title.  A visual
inspection was used to tweak a few unexpected resulting titles.

Signed-off-by: David B. Kinder <david.b.kinder@intel.com>

doc/user-guides/acrn-shell.rst

@@ -54,12 +54,12 @@ The ACRN hypervisor shell supports the following commands:
      - Write ``value`` (in hexadecimal) to the Model-Specific Register (MSR) at
        index ``msr_index`` (in hexadecimal) for CPU ID ``pcpu_id``
 
-Command examples
+Command Examples
 ****************
 
 The following sections provide further details and examples for some of these commands.
 
-vm_list
+Vm_list
 =======
 
 ``vm_list`` provides the name of each virtual machine and its corresponding ID and
@@ -70,7 +70,7 @@ state.
 
    vm_list information
 
-vcpu_list
+Vcpu_list
 =========
 
 ``vcpu_list`` provides information about virtual CPUs (vCPU), including
@@ -82,7 +82,7 @@ STATE (init, paused, running, zombie or unknown).
 
    vcpu_list information
 
-vcpu_dumpreg
+Vcpu_dumpreg
 ============
 
 ``vcpu_dumpreg vmid cpuid`` provides vCPU related information such as
@@ -107,7 +107,7 @@ function ``acpi_idle_do_entry``.
 
    system map information
 
-dump_host_mem
+Dump_host_mem
 =============
 
 ``dump_host_mem hva length`` provides the specified memory target data such as
@@ -132,7 +132,7 @@ pCPU number is 0x0000000000000004.
 
    acrn map information
 
-dump_guest_mem
+Dump_guest_mem
 ==============
 
 The ``dump_guest_mem`` command can dump guest memory according to the given
@@ -152,13 +152,13 @@ in guest console or through the ``system.map`` (Note that the path for
 
    guest memory information
 
-vm_console
+Vm_console
 ===========
 
 The ``vm_console`` command switches the ACRN's console to become the VM's console.
 Press :kbd:`Ctrl` + :kbd:`Space` to return to the ACRN shell console.
 
-vioapic
+Vioapic
 =======
 
 ``vioapic <vm_id>`` shows the virtual IOAPIC information for a specific
@@ -170,7 +170,7 @@ VM1:
 
    vioapic information
 
-dump_ioapic
+Dump_ioapic
 ===========
 
 ``dump_ioapic`` provides IOAPIC information and we can get IRQ number,
@@ -181,7 +181,7 @@ IRQ vector number, etc.
 
    dump_ioapic information
 
-pt
+Pt
 ==
 
 ``pt`` provides passthrough detailed information, such as the virtual
@@ -193,7 +193,7 @@ trigger mode, etc.
 
    pt information
 
-int
+Int
 ===
 
 ``int`` provides interrupt information on all CPUs and their corresponding
@@ -204,7 +204,7 @@ interrupt vector.
 
    int information
 
-cpuid
+Cpuid
 =====
 
 ``cpuid <leaf> [subleaf]`` provides the CPUID leaf [subleaf] in
@@ -215,7 +215,7 @@ hexadecimal.
 
    cpuid information
 
-rdmsr
+RDMSR
 =====
 
 We can read model specific register (MSR) to get register
@@ -238,7 +238,7 @@ and see that 1B (Hexadecimal) is the IA32_APIC_BASE MSR address.
 
    rdmsr information
 
-wrmsr
+WRMSR
 =====
 
 We can write model specific register (MSR) to set register

doc/user-guides/hv-parameters.rst

@@ -3,7 +3,7 @@
 ACRN Hypervisor Parameters
 ##########################
 
-Generic hypervisor parameters
+Generic Hypervisor Parameters
 *****************************
 
 The ACRN hypervisor supports the following parameter:

doc/user-guides/kernel-parameters.rst

@@ -3,7 +3,7 @@
 ACRN Kernel Parameters
 ######################
 
-Generic kernel parameters
+Generic Kernel Parameters
 *************************
 
 A number of kernel parameters control the behavior of ACRN-based systems. Some
@@ -379,13 +379,13 @@ section below has more details on a few select parameters.
 
 .. _GVT-g-kernel-options:
 
-GVT-g (AcrnGT) Kernel Options details
+GVT-g (AcrnGT) Kernel Options Details
 =====================================
 
 This section provides additional information and details on the kernel command
 line options that are related to AcrnGT.
 
-i915.enable_gvt
+I915.enable_gvt
 ---------------
 
 This option enables support for Intel GVT-g graphics virtualization
@@ -393,7 +393,7 @@ support in the host. By default, it's not enabled, so we need to add
 ``i915.enable_gvt=1`` in the Service VM kernel command line.  This is a Service
 OS only parameter, and cannot be enabled in the User VM.
 
-i915.enable_hangcheck
+I915.enable_hangcheck
 =====================
 
 This parameter enable detection of a GPU hang. When enabled, the i915